At the risk of adding some uncertain value to this, there may be a S/N stamped on the inner surface of the yoke. It may be visible if viewed through one of the chambers. Given the degree of effort in removing the original S/N and other markings, this may be gone as well, or if this is a parts gun, may have no relationship to the frame S/N.
Only real value of that number (if it's there) will be for your police chief in running the weapon through the NTC. If that S/N comes up in the NTC check, it may shed some light on the history of that gun, or may be completely unrelated. Good luck, and I hope you get to have that gun established with a valid S/N; the alterations aside, I have a warm spot in my heart for 4" M29s.
That's good advice! Although the gun appears to be a 3 screw, therefore the serial # on the rear face of the yoke arm was deleted much earlier, in 1957.
A gun of this vintage will only have these 3 # locations:
1. Butt
2. Extractor star - backside
3. Right stock – backside
That's why in post #4 I asked the OP to look for the original serial # on the back side of the extractor star with a flashlight and magnifying glass. Pushed out like when extracting empty cases and look there.
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