Note.....mbcinfo.com web server seems to be down. Much of the content on the page noted above may be found at Brewerania.com at this URL:Randy Karasek made a terrific page full of information on this topic. It is still live here:
http://www.mbcinfo.com/Post/CanCodes/
I have a request in to him to replicate that information and mirror it on this forum.
Rand
http://www.breweriana.com/beer-can-appr ... -cans.html
Rand