Thanks art.
akdrv, I honestly have no idea what is going on. I am assuming that these coins were long ago cracked out from mint sets and hence ended up to be in this pile. Shocking as it may seem to but I guess about 30 mintsets have at least been cracked out. (or must be ripped out from those plastic mint set)
Nevertheless here are two images to compare:
The first one is a 1961 ruble from a specimen set that I have, that I believe is strictly UNC.

The next one is one of the suspected "proof" rubles for illustration:

I believe I can see about 2-3 inches of reflection in there although the photograph isn't too good in what I took. Does that look like proof or that's still a prooflike?

Nevertheless, I don't believe circulated coins are ever minted in such quality.