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Can someone please explain what these three numbers mean on the pedal crank housing? I believe this to be the pedal crank housing from a 1956 Spitfire Ladies Bike.

Serial reads M0D502 (small top left) The Serial reads 46772 (medium right) The large Serial reads 13 5 124

The Schwinn Serial reads M0D502 (hard to see but top left) The next number reads 46772 (medium right) The large number reads 13 5 124

One of my concerns is this... The Schwinn serial numbers that date the bike to the fall of 1954 or 1956, but I believe the Serial numbers for 54 and the 56 were located on the Left Rear Dropout - not located on the bottom bracket of the pedal crank housing. Why would this be?

Additionally what does the 46772 indicate? and what does the 13 5 124 indicate?

Thank you so much for all of your help!

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Not much help but FWIW, the number on my early-1970's Schwinn Suburban is on the steering housing, two letters followed by six digits, in the range of HK549xxx. I presume that is the frame's serial number since it's both highly visible and the only number I can find. – keshlam Jun 28 '14 at 19:30
Again, dunno about this case, but other numbers on a piece often indicate model number, mold number if cast, and manufacture date. – keshlam Jun 28 '14 at 19:32

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