Have you ever come across a M1892 revolver with BP proofs, and if so - which proofs were they? if you have that would be interesting. I have never encountered BP proofs one on the M1892commercial or military revolvers I've seen.
Yes, I have seen black powder proofs on both military and commercial M1892 revolvers. Look for them at the rear of the cylinder and the bottom rear of the barrel on the government made ones.
The list of proofs I posted a picture of above are mainly for the commercial black powder proof marks for all types of guns/firearms that are sent to one of the government or one of their approved proof houses.
The military issue government made St. Etienne arsenal pre 1897 Black powder proof mark for these revolvers is this -
and the post 1897 St. Etienne black powder proof mark is this one
.
My 1874 dated Gras M1874 rifle has the exact same proof mark on both the barrel and receiver and I have a 1893 dated M1892 government made revolver and both the barrel and cylinder have the above first Black powder proof.
Your original question was asking about proof marks on commercial guns/revolvers, so this is why I posted that info.
Also keep in mind that a lot of M1892 revolver clones and very similar copies were made in Belgium and Spain among other places and they will have proof markings for those countries on them.
French Government made M1892 revolvers have a proper black powder proof mark on the bottom of their barrel under the ejector rod and on the rear face of the cylinder as the French proof act of 1885 required both the barrel and chambers to be proofed at that time.
The picture I posted above of a commercial M1892 revolver clearly shows the St. Etienne multi barrel/chamber commercial black powder proof mark in the cylinder flute, the most common manufacturer of these commercial M1892's in France was Lamure et Gidrol and the were located in St. Etienne too, and they were I believe, owned by Manufacture d'Armes et Cycles de Saint Etienne.
And here is a picture of a military M1892 barrel with black powder black powder proof, the other numerous marks/stamps on the revolver being what is called in French a Poincon (hallmark or punchmark) inspection and quality approved/passed markings that were dropped as a requirement in 1915 I think. Each inspector had his own Poincon (hallmark) stamp as the revolver parts went through their manufacture stages they were stamped on completion and quality inspection pass. -
Here is another picture of commercial French proof marks at St. Etienne -
And I found this which may be helpful when looking at older French proof marks -