What do the letters and numbers on the bottom of a Zippo mean?

Related questions

1. Do zippos come full?
2. How long is a Zippo Wick?
3. What is the most expensive lighter?
4. Can you use charcoal fluid in a Zippo?
5. Can you carry a Zippo in your pocket?
6. What do I do if my Zippo won't spark?
7. Do you have to use Zippo lighter fluid in a Zippo?
8. How long can a Zippo stay lit?
9. What do the slashes on a Zippo mean?
10. What is the liquid inside a lighter?

Tags

1. #beginning
2. #right
3. #march
4. #zippo
5. #system
6. #denoted
7. #arabic
8. #roman
9. #numerals
10. #however
11. #changing
12. #stamped
13. #denoting
14. #january
15. #conventional
16. #which
17. #letter
18. #february
19. #underside
20. #altered
21. #numeral
22. #month