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I'd agree with that. The one I posted pics of I know from the etching to be from between 1854 and 1856. Yours looks contemporaneous with it so I'd say somewhere in that time period is probably pretty...

That was a popular style of blades in the 19th century. Here's one made in the 1850s with the same general shape.
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Many of them had elaborate etchings. One word of warning about that. Even...