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I haven't seen that tang stamp before. Not familiar with it. As to dating the razor, I'm going by Robert Doyle's "Collecting Straight Razors". Out of print now but worth the $ if you can find a copy...

IIRC framebacks didn't begin until the 1830s or thereabouts. The seller says "hoof horn" scales .... must have been some long hooves on that animal. ;)