Very interesting. Haven't seen before. What is it made of? Does it seem like aluminum? If so, unlikely it is late 1870s to mid -1880s, because at that time aluminum was more expensive than silver, and this piece looks crudely stamped and constructed. Wasn't until 1890s that aluminum was more cheapily processed and available. If its sheet steel (you can tell if it is magnetic), then ignore what I just said.
Very cool! Congrats.
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