I believe it is a '40/'41 as the frame previous to this didn't have a curved seatpost and had a straigt downtube, and the postwar had a straight seatpost and a curved downtube. Your serial number is confusing in that I believe the M is an upside down W...as WG was code for a Gambles Hiawatha
Jason
The only thing I can tell you about this bike...
It belongs in my garage.
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