The publication by KSS member Yi Yong Suk of an article about North Korean stamp sheets elicited an answer by another KSS member, Chen Yi-Fu. This led to the following exchange of information between these two members about the question of domestic printings versus international (collector’s) printings.
The question by Yong Suk was:
Recently Chen Yi-Fu mentioned that printing “stamps for domestic use” started from the late 1970s and that early domestic versions can be distinguished easily from the international version because of the quality of the paper used. In my collection of 1989 13th World Youth Festival 30 Jon stamps, one stamp comes with brown paper and other comes with higher quality paper. I always thought that one was real and the other was fake. Please check the image and let me know what you think?