Now after I returned to this hobby, I'm trying to organize my old collection.
There's some stamps which I'm not able to identify so could somebody help me with this problem.
Pic1
Row 1: no.1 Korea, no.2 Republic of China, no.3&4 People's Republic of China
Row 2: no.1-4 People's Republic of China

Pic2
Row 1: no.1-4 People's Republic of China
Row 2: no.1 Bulgaria, no.2 People's Republic of China

Thank you for you help
Jani