While you have the stocks off, look to see what serial number is stamped on the inside surface of the right panel. Those are rounded magnas, a style called PC grips. The common interpretation is that PC stands for Plain Clothes, because LEOs who worked in street clothes could carry short-barrel revolvers under a jacket without printing so obviously. But there's another explanation for the initials that I don't remember right now.

PC stocks first came along in the early to mid-1950s, I believe, so the ones on that gun probably won't number to the frame.

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David Wilson