I've been trying to put together a serial number registry and have found no dating pattern yet from these numbers. I have 8 so far ranging from 1823 to 5397 and only one confirmed purchase date for #2527 bought in June 1974. Also seems to be no relationship in serial number and frame size.
They all have various decals such as: MM badge with Metcalfe down tube MM badge with MKM down tube MKM badge with Metcalfe down tube MKM badge with MKM down tube
I don't know if the serial number sequence/system changed with the change of decals and also 3574 seems like alot of frames if it is really sequential. Any ideas??
Still workin it, Derek Willburn Long Beach, CA
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