I have tried to show some of the arsenal markings found on the receiver and/or receiver covers of some of the various
SKS's. The countries that I know of with no special markings in these areas are: Albania and Yugoslavia. I am
not sure on the East German but would suspect it to be a 1 in a triangle similar to the East German marked Russian SKS.
The Chinese markings are too numerous to list now but can be found on http://www.simonov.net/
Hope this provides you with some good information.
Later I will be showing variations among the parts on the various Russian makes. If anybody has an East German
or a 1949 Russian picture that wouldn't mind me posting it here I would appreciate it. Drop me an email.