Something unusual and you can even purchase it if quick enough.

It looks like a printing block showing a straight razor (Thiers Isaard). Must have been used for printing advertisements of some kind
 
It's an ancient tampon cutter! Why would you need an ancient tampon cutter?

I'm almost positive that's what it is.

ANCIEN TAMPON D'IMPRIMERIE RASOIR COUPE CHOUX LE DANDY THIERS ISSARD
translated:
Ancient Tampon Primary Razor two-door chook for dandies and their Issard.

That's word for word right there.

Mercy buckets.
 
I suspect it's use was to lay down a paint imprint upon a vintage straight.
 
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