Those are variously called I-frame extension stocks, two-screw stocks, or large square butt stocks; that last phrase distinguishes them from the Regulation Police style of stocks, where also called small square butt stocks.
They are indeed S&W stocks. The absence of medallions means that they were manufactured for use on I-frame revolvers (mostly the .22/32 target revolvers) during the 1920s. In the 'teens, these stocks had deep set gold medallions. In the 1930s, they had flat mounted silver medallions.
You also sometimes see them in hard rubber on the earliest I-frame target revolvers.
Prices of old stocks fluctuate. You would probably hear a value for those ranging from $75 to $130. A few years ago I paid $95 for a really nice non-medallion set, but I don't know what the market has been like since.
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David Wilson
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