GRจีอาร์ - AN OVERVIEW

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。N.R. in SeoulN.R. in Seoul 64511 gold badge88 silver badges1515 bronze badges three Only for clarification on the primary gum - On the earth of philately (Stamp gathering), initial gum signifies that the stamp was hardly ever connected to anything a