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That appears to be a 1970's Japanese manufactured Schwinn serial number. The letter corresponds to the month of manufacture (i.e. A=January, B=Feburary, etc), L being equivalent to December. The year of manufacture was indicated by either the first or second number following the letter, so 1972 or 1978. The badge plate on the head tube (should be oval shaped and say something like "Approved Japan" at the bottom should have a 4 digit number stamped on it. The first 3 digits of this number are the number of days into the year that the bike was manufactured (your's should be be around the 330-365 range) and the fourth digit will again indicate the year, so if the last digit on the badge is a 2, then 1972, if it's an 8, then 1978.

If anyone can double check me on this, it would be appreciated.

-Josh

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14y ago
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Q: What year is a Schwinn serial number L280611?
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