[ithacaartist]

The mag bottom displays rather crusty looking "dishes," while the bottom is smooth and clean, and appears recently finished. The parts of the knobs' circumferences that become flatter when the serial number is removed look pretty danged flattened to me. The pins don't seem to have been disturbed, so my sense is that it's a DWM mag that was force-matched to this pistol.

The digits of the font used to number the mag should be compared to others known to have been marked at that time, which may yield further clues.

It would be a shame to blow out the bottom of an original mag, whether it's been doctored or not. Grab a couple Mec-Gar mags next chance you get, and use those for shooting.