Hello
I'll take a wild guess that it may have been made for the Mauser C96 Semi-Auto pistol from the 1890's. It looks like it would be a good fit due to the wide width and narrow barrel section. If so, it would be a nice find. Apparently, this pistol remained popular from the 1890's through the 1930's. Anyway, just my best guess at the moment.
Rick
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