July '81įor the first year or so it was a hand stamped 4 or 5-digit #. removed BB gusset and added brake bridge. After February 1977, (CB7) the second generation frames appear without the extra gusset between down tube and seat post tube.Ģnd gen. Example: CB6 # (C=Chatsworth B=February 6=1976). It then changes again later into 1976 to include place of manufacture/month/year code followed by a five number individual frame ID. They begin at 10001 and continue until early 1976 when a revised stamp begins to include place of manufacture indicated with the letter 'C' ( for Chatsworth, California) followed by the five number individual frame ID. (located on the underside of hanger cup/bottom bracket shell):ġ975 serial numbers were a hand-stamped five number, individual frame ID.
gusset by the bottom bracket, a coaster tab but no brake bridge.
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