St Pierre & Miquelon - Scott 12-14 On Pieces With Stamped Signature

Real or not?
Whose signature is this?
An expert?
Tell me more...

Signature of Calves (French Expert)
https://www.rhonephilatelie.fr/cont...s-collection

The very late date of 1893 is very dubious.All the remaining stocks where burned some years before.It could also be a purely Philatelic cancel,in which case the vignette never saw actual postal use.The early dates prevail for genuinely canceled vignettes.
Forgeries exist even with signatures (Study required).Info on these:

http://www.spm-philatelie.com/etude3.php

Some Genuine types in a ROUMET auction.

http://www.roumet.com/droite.php?no...-ET-MIQUELON

I do not believe the signatures are genuine. The "C" in the genuine is square/squarer, the "s" is smaller and different than done here. Further, Roger Calves imprint signatures are very clear, small but readable from a distance.

I have seen similar if not the same false Roger Calves signatures on a few stamps on piece or covers, all illegal bisects or odd usages. I can find no reference about them, however.

A couple of genuine types:

Very good information. Thank you, all.