C., said the kind of publicity that comes with such a milestone is more valuable than typical advertising, because it has built-in credibility.
Fortunately, those date codes are a tremendous help today in the ability of collectors to correctly identify the year any given Zippo lighter was made.
Another 10,000 or so will be made with high-polished Armor cases with gold engraving to mark the occasion.
The chrome replicas will sell for and the Armor for 0.
AFAIK, Zippos are coded with roman numerals in relation to their quality, the XIII (13) on your "Zippo" is clearly fraudulent. They are both Naptha based and evaporate quickly, burn clean and not extremely flammable.
That's on the extereme high end of the number scale. I've got several Zippos dating back as far as 30 years. Meaning you won't burn yousel ftoo bad if you fuck up.