I started thinking about this when AKPhilately posted Karl Bickel's signature on the engraved stamps thread.

It started me thinking how we can sometimes work out who was the most likely engraver by signatures on proof sheets. It isn't definite as sometimes a head engraver might sign off on another's work, or so I'm told.
I thought it was worth a separate thread where we could collect the signatures that we have found in one place and discuss how likely it is that they engraved the stamp. Most of the ones I have are French and as they tend to tell you who the engraver was, they don't add much.
Today, I was working with Canadian stamps and looking at the Canadian archives site at
http://www.collectionscanada.gc.ca/...30113_e.htmlWhen you look at a stamp there, there is a spot where you can click to see all the other items related to that stamp and this generally includes proof sheets.
There are several proof sheets of stamps known to have been engraved by Yves Baril, such as this one.

All have this signature on at least one of the proofs so I'm pretty certain, looking at the backward sloping "B" that this is Baril's signature. Actually, this looks less like a B than most of them.

Following on from here, there are several stamps that were engraved around the same time that have no engraver listed in Gibbons or in the canadian Archive. These do, however have that signature on a proof sheet.

1956 Prime Ministers: Bennett. SG 483 Scott 357

1956 Prime Ministers: Tupper. SG 484 Scott 358
There are others but rather than write a book, I'd like to get opinions from other engraved stamp enthusiasts.