Thanks for your feedback! I was planning to fire it (I've had a couple gunsmiths look at it and pronounce is safe for fire), but I think I'll wait until I've got a better idea if the blueing is original or now. The magazine does not match and the back sides of the original grips are pretty much free of markings, though I think I can just make out some faint depressions that might be the number 42. I plan on doing a rubbing to see if I can confirm that.
I'll attach some more pix. Looking at the various markings under the microscope indicates the edges are nice and sharp. I'll look again at the various edges to see if they're more rounded than sharp, but I sure would like to find someone knowledgeable in my area to get their opinion.
Here's some more pix:
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