They came in Candy Red or Blue over Nickel. '75 -'76įrom '81-'83 they started using this code (it moved around alot) July '81įor the first year or so it was a hand stamped 4 or 5-digit #. JanuJanusaarf Tagged de rosa columbus steel bmx vintage milan, freestyle, old school Leave a comment Leave a Reply Cancel reply Enter your comment here 1 Bicycle Frame Serial No Dating The Online Bicycle Museum Check the Serial Number data field in the BIOS Main menu By the 500-600 range somewhere begin.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.

Vintage mongoose bmx serial numbers