Originally Posted by
Scooper
Schwinn used the "old style" date coded serial numbers through late 1984 (e.g. D8435, which would translate to the 35th frame built in April, 1984). Sometime between 1983 and September, 1984, the serial number was moved from the left rear dropout to the bottom of the BB shell. Then, sometime between September, 1984 and April, 1985, they switched to the long "self-describing" serial numbers (e.g. 520AD8584, which translates to a 52cm seat tube frame using a fork with the short production steerer tube, 84th frame built during April, 1985). ...
For their top-end mountain bikes, the Paramountain and KOM-10, they retained the old style date code through the 1980s -- see my signature. Different numbering for different factories ...
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069