Originally Posted by
stumpjumper
Since the supersports were made on the Paramount line in the Chicago factory, they followed the Paramount serial numbering scheme rather than the Schwinn one until the mid 70's I beleive. This would make your frame the 457th frame produces in September of 1969.
from
http://www.waterfordbikes.com/site/c...ara_dating.php
That looks close, but is not quite right. You'll notice that the Paramount numbers up through the end of 1965 were a letter and three numbers (Axxx or Pxxx from '38-'59 and then A-Zxx from '59-'65 when they went to the scheme described above).
The fillet brazed bikes used a separate number scheme.
The 1962-1963 Superiors, 1964-1969 Super Sports and 1968 S/S Tourers had a serial number that was located on the left rear axle hanger and consisted of a single letter code for the month (skiping "I" and "O"), the last digit of the year and a 3-digit sequential build number -- e.g. 'K6018' is the 18th frame built in October of 1966. The 1970 Super Sports with Huret dropouts used a two digit year ('C70204' -- March, 1970, 204th frame). Super Sports after April of 1970 went to the "normal" EF Schwinn number scheme (now located on the headtube) with the letter for the month, letter for the year and a series of five or six sequential digits depending on production. I'm pretty sure at this point the fillet-brazed bikes lost their unique numbering and were in the mix with the other million Schwinns produced annually.
Bob