It's probably a typo, or maybe some really good preservative has been discovered, but printed clearly on the side is the expiry date: "21 DEC 34".
Droši vien tā bija drukas kļūda, taču, iespējams, atklāts jauns, patiešām labs konservants, jo uz etiķetes skaidri bija norādīts derīguma termiņš — „21 DEC 34”.