Eric, "byf" is a wartime code for Mauser. The 42 means 1942 the last year for Mauser P.08's. From your description it is half matching meaning that the top is from one gun and the frame from another. As to value about $450-$600, but could go for more if someone wanted it for parts.
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Suppose you were an idiot.....and suppose you were a member of Congress.....But I repeat myself" ~~ Mark Twain
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