This is the third Invicta wristwatch I've reviewed on Amazon, the first two being the gantuan model 1435 and the gargantuan model 1531.

MASS

This product, the Invicta Men's 10664 Pro Diver Collection Bracelet and Rubber Watch Set, weighs 125 grams with the metal band.  (I don't know what it weighs with the rubber bands because they were not included in the box I received, but no doubt it's less, not more.)  125 grams is 4.4 ounces, which is so much less than the other two Invicta watches, which are 52% and 73% more massive, that I regard this as a treat to wear on my left wrist in comparison.  It's like a feather compared to, say, 1.52 or 1.73 feathers.

Or try this: 125 grams is the same as 22 US quarters.  Or 50 pennies.

SIZE

According to my calipers the thickness is 11 millimeters, just as described.  That's 0.4331 inches, or 55/128ths of an inch.  Or try this: It's 10% thicker than a regular CD jewel box.

And the watch case really is 38 mm as advertised, although if you add in the crown the equatorial diameter rises to 40.7 mm, which is 1.6025 inches, or 1-77/128 inches.  Or try this: It's 80% of the length of a AA battery.

APPEARANCE

It's an attractive wristwatch if you don't mind that it will strike some of fuddier of the duddies at the next white-tie White House state dinner you attend as a bit garish.

As the photos on Amazon show, there's a pretty prominent silver bezel surrounding a blue face with gold hands and index marks.

Notice in the last sentence that there's no comma between "pretty" and "prominent."  If the bezel were absent this would be a sleeker, more dressy wristwatch.

The dark blue background of the face is kind of interesting to observe from different angles relative to the brightest light source: It subtly lights up in two opposing sectors and the rest is darker.  You can see exactly what I mean by clicking the photo of the face of the watch and, when you see the zoomed in version, observe the lighter portion starting inward from 10:00 o'clock to 10:30.  (Whoever took this photo didn't think it through though, because both of the opposing sectors that are interesting are partly obscured by two of the three hands.)

PHOTOLUMINESCENCE

The three hands and the twelve hour marks and the 0-degree mark on the bezel are treated with something called Tritnite, which is photoluminescent, meaning it absorbs photons of light and then emits them.  To be of use the amount of light emitted must be enough to make those 16 marks visible in varying levels of darkness, and here the Invicta men's model 10664 comes in second to my real diver's watch, a 20-year-old Citizen whose photoluminescent substance is notably brighter and longer-lasting and requiring of less charging to begin with.  I subtract one third of a star for this deficiency.

WATCHBAND

The two-step clasp method for the metal band works quite securely.  To open it you must pry up a small hinged door with your fingernail and then rotate a friction clasp, which opens up the band quite wide so it slips off easily.  If you can't slip a fingernail under the center of that door you can lift it up from either side.  Reversing the process, i.e., putting the watch back on your wrist, is quicker.

As with other watch brands with this type of bracelet (think Rolex), you must make a one-time adjustment of one or both of two really tiny pins.  You must remove the pin and then reposition it.  It's doable if you have a really tiny poking device and if you know how to do it and you have the visual acuity and the patience and the hand-eye coordination and a willingness to fiddle a little or a lot depending on how fast you catch on to the multi-step process.  Not to mention the equal willingness to chase down these surprisingly complicated little spring-loaded pins when they launch themselves across the room if you don't know how to do it and don't have sufficient visual acuity and patience and hand-eye coordination.  Of course you can always take it to a jeweler or a watchsmith; if you do be sure to learn from her exactly which size these pins are and consider buying a spare or two in case you decide to try this procedure yourself and sproing a pin into space and never find it again.  (Tip: The best place to try this at home is the shower, where you'll almost certainly be able to find a sproinged pin.)

If moving the two pins as close together as they can be still doesn't make the band small enough you'll have to remove one or more links, which requires all the above-mentioned characteristics and the proper tool but even more skill and knowledge or the name of a jeweler or a watchsmith.

I'm not disappointed in this watch because that wrist-circumference adjustment process is so difficult for newbies (I've been doing it myself for years), I'm disappointed that no mention is made in the manual of what to do if the bracelet doesn't happen to arrive in your mailbox already set to the perfect distance.

ACCURACY

In the 15 days I've had this exact watch it has lost two seconds.  I know because I used my atomic-clock wristwatch, a Casio G-Shock, to set it and just now check it.  Even at four seconds a month, that's pretty good for a non-atomic-clock quartz movement.  Of course, the watch you buy might be different.

Aside from telling the time, the watch also tells the date of the month, but you have to be careful to set it correctly or it won't wake up and turn over till noon.

MISSING FUNCTIONS

There are many functions other watches perform that this model does not.  Here's a partial list.

-- It does not tell you whether it's AM or PM, and it does not tell you the day of the week.

-- It does not depict the phases of the moon or predict the tides in your location or tell you exactly where the ISS is at any given moment.

-- There's no compass or GPS or thermometer or barometer or anemometer or sphygmomanometer or pulse-O2 meter or Breathalyzer or mass spectrometer.  It doesn't shoot laser beams.  I don't know yet whether it can deflect bullets.

WATER-RESISTANT

However, the Invicta Men's 10664 Pro Diver Collection Bracelet and Rubber Watch Set is water-resistant to 200 meters, which is way, way deeper than you will ever dive if you think this really is a diver's watch.  And it does sport a rotating bezel to let you know when your air is about to run out, and the fact that the photoluminescent light being emitted is relatively dark is irrelevant, because at 656.2 feet -- over an eighth of a mile down --  you're going to need a flashlight anyway (which, by the way, this watch also does not have).

To test this claim of 200 meters I built a cylindrical concrete tower that tall and with an inside diameter of, of course, 40.7 millimeters. Then I filled it with 69 gallons of imported seawater, spilling just over 2 pounds in the process, and dropped the watch down to the bottom and waited a couple three hours, which I figure is about as long as you're ever likely to stay at that depth unless your name is Aquaman, which it's legally not because it's trademarked by DC Comics.

The formula for the volume of a right cylinder is Pi r^2 h, where r = radius and h = height.

= Pi * r^2 * h
= Pi * ((40.7 mm / 2) ^2) * (200 m * 1,000 mm/m)
= Pi * (20.35 ^2) * 200,000 mm in 200 m
= Pi * 414.1225 * 200,000
= 260,200,840.737248 cubic mm

(You can take my word for converting from 260,200,840.737248 cubic millimeters to 68.7377901 gallons, or you can calculate it yourself just to see whether I'm right.  Or you can just type "260,200,840.737 cubic milliimeters in gallons" in Google.

No matter what, the point is that upon retrieval from the bottom of that 65-story column of water the Invicta 10664 watch continued to work fine.

WARRANTY

Page 55 of the manual describes the warranty.  You can open a PDF of the manual for this Invicta product and about a hundred others (which is a significant problem unto itself and for which I subtract 2/3 star) -- and I recommend you do so before you buy this watch -- using the link in the Product Details section of the Amazon page for this product to see the warranty for the model 10664 under review.

I draw your attention to the 12 terms you need to know about in order to get warranty service, including number 5, which requires you to pay $25 for "S&H," which I can only assume means shipping and handling. But you must not only pay the $25 for shipping and handling, you must also pay the shipping fee to send the watch back.

Not only that, you must pay Invicta the $25 by using snail-mail, which is slow and more subject to "unexplained" delays.  And not only that, you must pay by money order, which for most people means a trip to the post office (expensive) or Walmart (not) or somewhere and is time-consuming either way.

I suspect some of these provisions are partly for the purpose of dissuading some buyers from availing themselves of warranty service. For this I subtract 1/3 star. You read through all 12 of these terms and you say, "To heck with it," and you give up before you begin.

SUMMARY

Five stars minus 1/3 star for relatively poor photoluminescence performance minus 2/3 star for a confusing manual minus 1/3 star for a relatively disadvantageous warranty equals 3-2/3 stars, which rounds up to 4 stars.

This wristwatch and the manual and the warranty are what they are.  The manufacturer's description on Amazon is accurate and pretty thorough.  It's a solidly built watch that tells you the time and the date of the month just as it says it will, and it looks just as depicted in the Amazon photos.  At the claimed list price on Amazon of $395 it's no deal, but at 80 bucks you might change your mind.

P.S.

A Winchester 38-grain .22 caliber long-rifle lead bullet fired from a Marlin Model 60 semi-automatic rifle with scope from a distance of ten paced yards that strikes the face of the watch DEAD center (I'm so proud) will not only break the watch it will also, as I probably should have foreseen, void your warranty.  Accordingly, I do NOT recommend you try this at home just to see whether I'm right.