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This could also work for January back to a previous year.
The number will have a production month letter in either the first or second position and a production year number in the other (first or second) position. For some Japanese built Schwinns the headbadge will have a 4-digit stamping that represents the assembly date and consists of the ordinal day and the last digit of the year (2456 decodes to the 245th day of 1976 or 1986 -- use decals and components to determine the decade).
The ordinal dating was adopted for Schwinn's domestic production in 1976.
of build 1 thru 365, the 4th (last digit) is the last number in the year. If you are not sure which decade the bike is from, check the parts and graphics on the bike to the pictures in the catalog pages.
The Chicago Serial Numbers consist of a letter representing the month of manufacture, a number indicating the last digit of the year (1960 - 1964; 0=1960, 1=1961, etc.) or a letter indicating the year(1965 - 1979; A=1965, B=1966, etc.), followed by a sequential series of five or six digits (e.g. If letters were used for date codes, they skipped the letters "I" and "O" as they looked too much like numbers.Note: This scheme is for all Chicago built non-Paramount models excluding 1962-1963 Superiors, 1964-1969 Super Sports and 1968 S/S Tourers (whose Serial Numbers are located on the left rear axle hanger and consist of a single letter code for the month [again, skip "I" and "O"], the last digit of the year and a 3-digit sequential build number -- e.g.