Serial numbers on bottom bracket housing from a 50s era Schwinn? 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.

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!
Are you sure that this is a Schwinn bicycle?

None of the numbers on the BB match the Schwinn serial number formats of the 1950s.

With all the numbers stamped on the BB it looks like Sears-Roebuck.

The 46772 might be the Sears catalog number.