What does the four digit number stamped on the lower leftside mean?

In: Riverside Arms

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Answer

I'm guessing this gun was manufactured prior to serial numbers being required by law and at some point afterward was turned in for repair work and was given this number so that it could be taken in an repaired.

It could be

a batch number used for inventory control within the factory. a model number (is it perhaps 5000 or 5100?). a part number a serial number (unlikely on a Riverside gun). or even an ID assigned by a previous owner.

First answer by ID1128817268. Last edit by Knowledge. Contributor trust: 628 [recommend contributor]. Question popularity: 44 [recommend question]

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