V/O Avtoexport was the Soviet agency charged with exporting bicycles (along with many other vehicles). I have been told that this rather beautiful item is their catalogue from 1964 - and, despite the lack of any printed dates anywhere in the document, I am inclined to believe this.
The derailleur bikes all share the same lug work, and I believe that they are all Kharkovs. They are the B-541 (scan 37), the B-551 (scan 39) and the B-34 (scan 41). The B-541 appears to have a Kharkov 4 speed pull-chain derailleur in the style of a Simplex Tour de France.. The B-551 and B-34 appear to have copies of the Campagnolo Gran Sport - and I assume that these are Kharkov models. There is some confusion about the B-551, in the specification sheet it is a 5 speed, whereas in the picture it clearly has a double chainwheel and front derailleur. Also notable is the fact that the B-34 runs 1/8” chain over a three speed freewheel.
I also note:
Browse associated derailleurs.
Kharkov (1st style) 1968?