After 1850 as that's when he invented the York razor maybe?
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Seems like William Wood was more of a merchant then an actual maker, found many reference to auction for watches etc with his name on them.
Attachment 163677
(and I wasn't disagreeing either, actually!)
Yeah, since all the ones I've seen like the one I linked to come from a pretty narrow time period, I wonder if there wasn't some kind of import issue. Presumably, all that black horn was getting shipped in from India. This leads me to research questions... :)