Schwinn Date Codes
A log of serial numbers for all Chicago Schwinns made between 1948-1982, as was recorded by the factory forman at the time! Very detailed - you can actually pinpoint the approximate day your bike was brought into creation! Also inculdes a link on identifying pre-war Schwinns.
The link address is: http://www.angelfire.com/rant/allday101/SchwinnCodes1.html