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Yep, horn if it's polished can look like plastic. There have been plastics around longer than you may think. Celluloid was first made in 1856.
Bob is right though. I have 2 razors on the way that...

Yep, made before the 1840s. That's when it became more common to put maker's mark on them.
By the way welcome to the forum. Hope you stick around. Maybe even decide to take up the straight for...