Viktor Pylayev (Number 68)
International Road-Racing Motorcycle Competition.
Leningrad. 1956 year.
Photo by Ivar Vaderpass
source: Andrey Spitzyn
Note by Andy Farrer:
#(2) looks like either 500cc 5T Triumph, or 650cc 6T Triumph Thunderbird.
Editors note; #2 does look like a Triumph, the others are oppozits. I’ll try and search the records.