Re: c.c conn
As far as I know the M means 'make #' or 'model #' and is right before the serial number. The M on my Conn from that era has an M in front of the serial number as well (for a reference.) and you're saying that the serial number is 180,1xx so it shoud be in the 1926-27 range, or if it's 18,01x ; the 1910-11 range.
I hope this helps you in your search. Other than that page for a reference I would also look at old conn saoxphones on ebay for the "M" too.
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