At least Molot tends to hide their billboard advertising under the handguard. They usually put their symbol on the rear of the receiver, underside of bolt, and I think on the right side of the receiver if I remember correctly. So far I have only seen Molot M44's and M38's. No 91/30's that I know of yet.
I have a few Molot's, as people said, they are located under the bolt (like that one in the pic) the right side the receiver (if I remember correctly), under the hand guard and then under front sight, then PW arms or whatever importer adds their two cents as well. It's something I try not to think about when I am shooting my Mosin's haha.
"Duty, Honor, Country. Those three hallowed words dictate what you ought to be, what you can be, what you will be." - General Douglas MacArthur