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Schwinn Madison

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I'm going to take an educated guess and say those numbers and the numbers on the bottom bracket are parts or ID numbers. When Schwinn started making all types of frames in all different sizes they had to stamp part numbers on the two rear dropout components since the tubing angels varied at the point where they were EF.
 
I'm going to take an educated guess and say those numbers and the numbers on the bottom bracket are parts or i.d. numbers. When Schwinn started making all types of frames in all different sizes they had to stamp part numbers on the two rear dropout components since the tubing angels varied at the point where they were EF.

Probably right on the id numbers, but lugged construction = brazing not EF.
 
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