1952 Russian with interesting stock markings

[Sindone]

I seen this posted on Facebook. I've never seen these stamps before.  Any input on them?

[running-man]

Does the poster indicate where this carbine came from or who might have marked it? Not sure why an SKS ("CKC") would have "RPK" stamped on it in Cyrillic in Russia.   Maybe there's no relation to the RPK firearm?

The cartouche is the old state emblem of the Soviet Union I believe:

[Greatguns]

Looks to have been stenciled and then etched out by hand after the fact by a previous owner. I've never seen that on any other Russian Model 45 SKS.

[Sindone]

Says it's a 1952 Russian