I could swear I have seen it on GB for longer than that, but it could be that it was sold and now being resold.
Anyway, I get the impression that the engraving is done with a rotary tool. It's difficult to see even if you enlarge the pictures, but there's something about it that looks more like handwriting than actual engraving. That doesn't mean that it's not period correct, but it seems a bit fishy to me.
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