Chainmail,
It might have been a 10 round mag. I only had possession of it for about 2 hours while we walked out of the bush. That was 50 years ago, my memory’s not was it once was. What I was most amazed at was that the magazine was not detachable and had to be reloaded while attached to the gun.
Understand. I am even more ancient!
An SKS can also be loaded by flipping it over, popping mag catch open, and dumping loose rounds point forward, then slapping the mag base closed.
I used to play with my captured SKS a lot.