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About the war: formally it's true. But we know and other facts:
https://en.wikipedia.org/wiki/German%E2%80%93Soviet_military_parade_in_Brest-Litovsk

And about the razor: I also add that according...

Sorry my mistake, razor is WWII era of course. Not pre-. 1940.

And first four symbol НКСМ = People's Commissariat (Department) of the middle-level machine-building industry (Народный комиссариат среднего машиностроения).
This Government Department was...

It's really soviet pre-WWII era razor.
It's not STIZ.
It's 2ГПЗ = The state ball bearing's plant #2 in Moscow (2-й государственный подшипниковый завод).
40 = year of item manufacturing 1940.
Rare...