2011 HTC S-Works Roubaix
2011 Tarmac Pro
2012 Sirrus Elite
2010 Raleigh Clubman
1980 Peugeot PX8M
Before 1965 serial numbers were stamped onto a rear dropout. Beginning in 1965 serial numbers were moved to the head tube and the following date system was used for all Schwinns except Paramounts. The letter at the beginning of the serial number indicates the month of manufacture, skipping the letter "I." For example, "A" = January, "B" = February, and "J" = September. The second letter of the serial number indicates the year of manufacture (not the model year), beginning with "A" = 1965. Skip the letter I & O. Sports Tourer KH017873, for example, was built in October 1972.
For more on Schwinn serial numbers, check out the Waterford site.
You probably ran across this already. I don't know if it will help.
Last edited by crushingmetal; 04-04-11 at 11:38 AM. Reason: mis-spelling
Your S/N appears to be BC**** which would be February 1967.
There will be additional date codes on the cranks, stem, and possibly the hubs.
There's always room for one more bike!
BC03421 = old