The M1917 revolver was created during WW1 to supplement the M1911, as by that point it wasn't as widespread as it'd become during WW2. Many of them served mostly in the American and British forces during WW1 and WW2, and, as many weapons in the market during the interwar period, some made their way to the Chinese Civil War, and, most likely, to the Spanish Civil War, as it was a prevalent revolver among police units of the world.
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