OPINION OF THE COURT
GIBBONS, Circuit Judge.
The defendant-appellants, Sterling-Coin Op Machinery Corporation, Sterling Equipment Corporation and Sterling Supply Corporation appeal from a judgment in the sum of $16,273.03 entered in favor of plaintiff-appellee, Congress Financial Corporation after a, non-jury trial. Sterling-Coin Op Machinery Corporation is in the business of selling coin-operated dry cleaning equipment. Congress Financial Corporation (Congress), a finance company, loans money on the security of installment paper. In 1962 Sterling-Coin Op Machinery Corporation entered into a financing contract with Congress. Sterling Equipment Corporation and Sterling Supply Corporation each unconditionally guaranteed the obligations of Sterling-Coin Op Machinery Corporation to Congress, and for purposes of this opinion the defendants will be referred to collectively as Sterling.
In October 1962 Sterling sold certain dry cleaning equipment to Marguerite Mueller and her husband Frederick Mueller for $28,051.33. Simultaneously with their execution of the conditional sale contract the Muellers executed a judgment note for $28,051.33 payable to Sterling’s order. The note contained a clause authorizing any attorney to confess judgment against them upon default for any unpaid balance.
In the general financing agreement between Congress and Sterling, Sterling undertook to repurchase on demand any installment paper sold to Congress upon which a default should occur. The Mueller conditional sale contract and judgment note were assigned to Congress by a separate written assignment, which in relevant part said:
“. . . [Sterling] warrants the payment when due of each sum payable thereunder and the payment on demand of the entire unpaid balance in the event of non-payment by the buyer of any monthly sum at its due date, or of any other default by the buyer without first requiring assignee to proceed against said buyer.
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[Sterling] warrants compliance with all filing and recording requirements, hereby agreeing that any filing or recording or renewals thereof which [Congress] may undertake at [Sterling’s] request, or otherwise, shall be at [Sterling’s] expense and without responsibility whatsoever on [Congress’] part for any omission or invalid accomplishment thereof, whether through [Congress’] failure, neglect, or for any reason, and such omission or invalid accomplishment shall not relieve [Sterling] of any responsibility to [Congress].
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The assignment shall be construed under the laws of the State of New York and none of the terms shall be modified except by a writing signed by an officer of assignee and notice of the acceptance thereof is hereby waived.”
The district court found that the quoted language of the assignment was intended by the parties to apply both to the conditional sale contract and to the judgment note. In a transmittal letter accompanying the assignment, conditional sale contract and judgment note, Sterling wrote:
“We are enclosing the Conditional Sale Contract on Bankers Commercial forms, covering a sale to Marguerite M. Mueller. Her husband has signed the guarantee on the back of Page 1.
You will also find enclosed a Judgment Note, endorsed to your order, with our recourse, signed by both husband and wife, which we ask you to record in the proper county, and send us the notice of recording.”
At the time they executed the judgment note in October of 1962 the Muellers owned certain real estate in Allegheny County, Pennsylvania. In March of 1963 they defaulted on the note. In December of 1963 they made a conveyance of the Allegheny County real estate. Congress did not record the judgment note in Allegheny County until September, 1964,( when it entered judgment against the Muellers in that county for $21,870.39.
Congress and Sterling pursued the Muellers and the transferee of the real estate. Eventually they agreed to a settlement with the Muellers whereby the latter paid $6,500 in cash and returned the equipment to Congress in exchange for a satisfaction of judgment and a release. Congress and Sterling ' agreed that the settlement was without prejudice to the rights and liabilities of either against the other. The $6,500 payment together with other payments which had been made by the Muellers left the outstanding balance on the original transaction at $12,517.73.
Congress sued Sterling for this amount. Sterling in its answer asserted the defense that Congress, as pledgee, had caused damage to the security and was thereby barred from recovery. Such damage, Sterling asserted, occurred because Congress failed to record the judgment note, and thereby failed to perfect a lien on the Muellers’ real estate, prior to the Muellers’ alienation of that property in December of 1963. An appraisal in evidence suggests that in December of 1963, just prior to transfer, the Muellers had an equity in the transferred real estate of about $25,000. Sterling filed a counterclaim for $1,900.50, the legal fees which it had expended in pursuing the Muellers for the $6,500 settlement. The district court entered judgment for Congress in the amount of $12,517.73 plus interest, and against Sterling on its counterclaim.
Sterling relies upon § 9-207(1) of the Uniform Commercial Code which provides;
“A secured party must use reasonable care in the custody and preservation of collateral in his possession. In the ease of an instrument or chattel paper reasonable care includes taking necessary steps to preserve rights against prior parties unless otherwise agreed.” N.Y.U.C.C. § 9-207(1) (McKinney 1964); Pa.Stat.Ann. Tit. 12A § 9-207(1) (1970).
It is common ground between Sterling and Congress that the duty to “[take] necessary steps to preserve rights against prior parties” ordinarily would include the duty to record an instrument at an appropriate time. Cf. Siedman v. Merchants Bank of New York, 7 U.C.C. R.S. 881 (1970). Under § 9-207(3) a secured party must bear any loss caused by its failure to meet any obligation imposed by § 9-207(1). Thus, says Sterling, Congress must shoulder the total loss caused by its failure to record the judgment note including the cost of collecting the $6,500 settlement.
Congress, relying on the language of the assignment quoted above and on the last three words in § 9-207(1) “unless otherwise agreed,” says that it had no duty in this case to take any steps to record. Certainly the language quoted from the assignment specifically purports to relieve the assignee of any liability for failing to record.
Sterling, however, argues that the quoted language is void under another section of the code, § 1-102(3):
“The effect of provisions of this Act may be varied by agreement, except as otherwise provided in this Act and except that the obligations of good faith, diligence, reasonableness and care prescribed by this Act may not be disclaimed by agreement but the parties may by agreement determine the standards by which the performance of such obligations is to be measured if such standards are not manifestly unreasonable.”
N.Y.U.C.C. § 9-102(3) (McKinney 1964); Pa.Stat.Ann. Tit. 12A § 9-102(3) (1970).
Both parties take comfort from this provision. Sterling claims that the exculpatory clause in the assignment amounts to a disclaimer of the duty of reasonableness and care expressly prohibited by § 1-102(3). Congress says that the clause is merely a determination by agreement of the standard of reasonable care imposed by § 9-207(1).
If the assignment contained the language “the assignee shall have no duty to record the judgment note” we would have no difficulty in holding that loss here must fall on Sterling. Siedman v. Merchants Bank of New York, supra. But an agreement to that express effect cannot be found in the instrument. If there is such an agreement it arises by implication from the warranty by Sterling of compliance with all filing and recording requirements. Yet the exculpatory clause itself obviously implies that in some circumstances Congress may undertake to record. Accepting ar-guendo that the warranty language is by necessary implication an agreement, within the meaning of the second sentence of § 9-207(1), that reasonable care does not require that the assignee record the judgment note, then the balance of the clause must disclaim a duty other than the simple obligation of a secured party to preserve collateral through rec-ordation. It would then operate in situations where a secured party, despite having contracted out of his ordinary duty to record, nevertheless undertook to record and did so without exercising care, thereby reducing the value of the collateral. So construed the exculpation from liability seeks to deprive the assignor in an action brought by the as-signee of any defense predicated upon the assignee’s careless impairment of the security.
It is not, however, in the light of all the papers, a necessary implication of the language of the recording clause in the assignment that Congress defined recording out of its § 9-207(1) duty of reasonable care. The assignment is on a printed form prepared by Congress and evidently intended to cover various kinds of commercial paper. Most such paper could and should be recorded at the outset. Other such paper, the judgment note here involved, for example, might not be recorded until after a default. The district court assumed that the judgment note could be recorded before a default, but that there might be sound reasons for waiting until after such had occurred. As we read the Pennsylvania cases, the note could be properly recorded only after a default, but, in any event, recordation after default was a reasonable alternative. This alternative puts in context the request by Sterling in the October 22, 1962 transmittal letter that Congress record the note in the proper county and send it notice of the recording. Under the circumstances it is certainly arguable that Sterling’s warranty of compliance with all filing and recording requirements is simply inapplicable to the judgment note, and that there is no agreement addressed specifically to § 9-207(1). If the assignment is read thus, the balance of the clause is not a definition of a standard of reasonable care, but an exculpation from liability for lack of reasonable care in performing a duty which may in fact have been undertaken. Such an exculpation is prohibited by § 1-102(3).
Even if we assume the first hypothesis — that the language of warranty by Sterling of compliance with all filing and recording requirements by itself would imply an agreement that the as-signee had no duty to record the judgment note — a question of contract interpretation remains.
Here Congress received an unrecorded judgment note together with a letter from Sterling indicating that the latter was looking to Congress for recordation. Congress contends that the letter of transmittal must be divorced from the note and assignment when determining its undertaking, but that the exculpation clause in the assignment must be construed as applicable to the judgment note. A more reasonable interpretation of the agreement, we think, would involve looking to all three documents for the intention of the parties. Taking this approach one is compelled to the conclusion that there was no agreement negating Congress’ duty under § 9-207(1), and perhaps even an undertaking, implied from the receipt and retention of the transmittal letter and the note, that Congress would record. Assuming this interpretation of the agreement, the attempted exculpation from liability for failing to perform the undertaking is void under § 1-102(3).
But even if we resolve all questions of contract interpretation in favor of Congress, holding that the assignment negates its pledgee’s § 9-201(1) duty to record, it fares no better. It is one thing to say that a pledgee who has contracted out of a duty with respect to collateral is not liable for losses caused by failure to record. It is quite another to say that a pledgee who having so contracted, undertakes nevertheless to act may by contract exculpate himself from his own lack of reasonable care and thus avoid application of the impairment defense.
Sterling’s letter clearly indicated that it was relying on Congress to record the judgment note. The uncontradicted testimony of Mr. Podgur, Sterling’s Treasurer, was that he first learned that the note had not been recorded when Muel-lers’ attorney in July of 1964 informed him the Muellers had sold their home and were insolvent. He investigated, and protested to Congress. By then the res had fled and both parties began the pursuit which produced only $6,500.
Congress took possession of the note, which by its nature was both the evidence of indebtedness and a form of collateral security, with full knowledge that additional steps were required in order to perfect the security against the Muellers, and with full knowledge that the pledgor, Sterling, was relying on it to take those steps.
Assuming that Sterling’s warranty of recordation shall be construed as an agreement that Congress had no § 9-207(1) duty, that agreement was one which it could properly waive. By its silence in the face of Sterling’s reliance as evidenced by the text of the transmittal letter it must be deemed to be es-topped from disavowing such a waiver. The question then is the effectiveness of the exculpation clause to protect Congress against a defense based upon a § 9-207(1) duty gratuitously undertaken, despite a contrary agreement, and relied upon by Sterling. Nothing in § 1-102(3) or in any other provision of the U.C.C. suggests that such a clause may be validated. If Congress waived the agreement limiting its § 2-907(1) duty then the duty to use reasonable care in preserving rights against third parties was operable, and the attempted exculpation was void.
Thus on any construction of the papers which was open to the district court the loss resulting from the loss of value of the collateral must fall on Congress. § 9-207(3).
There remains the question on liability to Sterling for the attorneys fees incurred in collecting from Muellers the $6,500 which after default was collected. Here, we think, Congress does fare better. The district court found that once the default occurred both parties were attempting to collect from the Muellers for their mutual benefit and that “[ujnder the circumstances the defendants were at least as negligent as the plaintiff in failing to take steps to verify the existence of the judgment lien.” That finding is not clearly erroneous (Fed.R.Civ.P. 52(a)) and Sterling’s contributory negligence bars its recovery from the negligent pledgee. Siedman v. Merchants Bank of New York, supra at 885. The district court should properly have left the parties where it found them. Code. Section 9-207(1) thereof provides:
A brief comment on the governing law is appropriate. In this diversity case we must look to Pennsylvania law as the source of our choice of law rule. Klaxon Co. v. Stentor Electric Manufacturing Co., 313 U.S. 487, 61 S.Ct. 1020, 85 L. Ed. 1477 (1941). The assignment contained a choice of law clause designating New York law as controlling. Pennsylvania courts would give effect to such a clause (Pa.Stat.Ann. Tit. 12A § 1-105 (1970)) and under Klaxon we must do the same.
New York and Pennsylvania have enacted identical versions of §§ 1-102(3) and 9-207(1). We have been referred to no case directly in point decided by the courts of either of these states and, in fact, to no such case decided in any state. Our examination of the few New York authorities bearing on the pledg-ee’s duty of reasonable care for the collateral convinces us that a New York court would decide the case as we have. See Siedman v. Merchants Bank of New York, supra, Grace v. Sterling, Grace & Co., 30 A.D.2d 61, 289 N.Y.S.2d 632 (1968). Cf. Reed v. Central National Bank, 421 F.2d 113 (10 Cir. 1970). And see Willets v. Hatch, 132 N.Y. 41, 30 N. E. 251 (1892).
The judgment of the district court will be reversed. The judgment in favor of Congress on Sterling’s counterclaim will be affirmed.
. This sum includes interest.
. Under Pennsylvania law recordation of the judgment in Allegheny County would have perfected a lien upon all of the Muellers’ real property located within that country. Pa.Stat.Ann. Tit. 12 § 861 (1953).
. For a discussion of the choice of law considerations involved in this case see pp. 456-457 infra of this opinion.
. N.Y.U.C.C. §§ 9-302, 9-304(1) (McKinney 1964); Pa.Stat.Ann. Tit. 12A §§ 9-302, 9-304(1).
. The court below expressed the opinion that immediate recordation of the judgment note might exhaust the underlying warrant of attorney thereby necessitating that the Muellers he personally served in order to perfect the lien resulting from judgment.
. Rose v. Cohen, 193 Pa.Super. 454, 165 A. 2d 264 (1960) strongly suggests that the judgment note in this case could not he recorded until after default since it authorized confession of judgment only after such had occurred. In the absence of limitations as to the time of confession, Pennsylvania judgment notes have been immediately recordable. O’Maley v. Pugliese, 272 Pa. 356, 116 A. 308 (1922). The continuing validity of such practice in light of Swarb v. Lennox, 314 F.Supp. 1091 (D.C.1970) is of no relevance here, for Swarb limited its own force to prospective application.
. Cf. 1 S. Williston, A Treatise on the Law of Contracts § 140 at 614 (1958) ; 5A A. Corbin, Contracts § 1240 at 565-66 (1964). See N.Y.U.O.C. § 1-103 (McKinney 1964); Pa.Stat.Ann. Tit. 12A § 1-103 (1970). Neither party attempts to argue that any usage of trade should affect the outcome of this case. See N.Y.U.O.C. § 1-205 (McKinney 1964) ; Pa.Stat.Ann. Tit. 12A § 1-103 (1970).
. N.Y.U.C.C. f§ 1-102(3), 9-207(1) (McKinney 1964); Pa.Stat.Ann. Tit. 12A §§ 1-102(3), 9-207(1) (1970).