Yes, they work. I know of no reproductions. Since they consist of several stamped steel parts rather than machined, making dies to reproduce them probably would not be a profitable venture...unless they were sold as originals, i.e. not cheaper reproductions. Even at that, with the prices originals demand there would not be a big market, so the profit margin might not be worth the time and investment to fake them.
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If it's made after 1918...it's a reproduction
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