Thank you very much. I was wondering the same thing re: Russian page mounting. I'm thinking my great grandmother was losing her marbles when she assembled the collection. I was excited about the prospect of a Russian stamp from the 1920's.
I'm 98%c certain they are pre- 1940 stamps because:
1. authenticity of book copyright 1934
2. avg age of collection
3. comparing to another stamp with a cancellation date 1955.
I've attached a photo of the postmarked stamp. This one is more than likely the 1940.
The 2d coil stamp only has perfs on the horz. and a straight edge on the vert. Is this correct?