Stamp collecting is a popular and rewarding hobby practiced all over the world.   This hobby requires no initial skills or expertise, and it doesn't have to be expensive. Beginning collectors are often thrilled by a beautiful piece of art on display, while adv...

Today I will present you with a small study on the mini-sheet "For Security and Cooperation in Europe - Madrid 1980" (BK 2931), conducted on 116 issues of the edition. The examined sheets include both the first printing (from number 1 to number 40,000) and the...