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I'm pretty sure the crown doesn't represent royalty, here.

To the best of my knowledge, the stamps referring to the monarch didn't begin until 1822. Earlier than that and the crown was a cutler's mark (like those stamped WOLF), so in this case the RP is most...

Any chance you could get a better closeup of the crown and RP? I'm not wholly sure it's a crown. Early cutler's marks were sometimes not as ... figural ... as all that.

That said, it might be...