Ed... You have a police mag that would been accepted by the police by virtue of the Eagle/C stamp on the bottom. The #2 above the serial number is also typical police markings. IMO the serial number to include the "2" would have been stamped at a unit level or police armory. I would date the mag to around 1938 or 1939.
It is a bit of a veteran but would be a treasure to the owner of the gun.
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dave
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