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The caption says those are wedge shaped blades. Perhaps in that book, as on the forum, the term "wedge" is used quite loosely and encompass true wedges, near wedges, and quarter hollows.

That...

There is no way that razor is a true wedge. I can see the hollowing very clearly in the photos you posted.

I can also see a thin bevel and thin wear on the spine. If it was a true wedge, the...

That is an interesting piece. The scales look older than the date you guessed, but the tail looks newer. And I'd bet the blade was reground too.

Very cool find.