They are especially common in Brazil, and are or were made there. I have been told that Brazilian law prohibits native peoples from owning repeating or self-loading arms but that double barrels are OK, so those guns are made for that market. Some were imported into the U.S. 50 or so years back, but there was little interest except as curios and importation stopped.
What caliber it actually is, I don't know unless the marking is ".32 ACP" rather than ".32 ACO". .32 ACP, of course, is the common .32 cartridge for semi-auto pistols.
Jim
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