Stamp collecting stamp collecting began at the same time that stamps were first issued, and by 1860 thousands of collectors and stamp dealers were appearing around the world as this new study and hobby spread across Europe, European colonies, the United States and other parts of the world. The first postage stamp, the Penny Black, was issued by Britain in May 1840 and pictured a young Queen Victoria. It was produced without perforations (imperforate) and consequently had to be cut from the sheet with scissors in order to be used. While unused examples of the Penny Black are quite scarce, used examples
Postage stamp problem Postage stamp problem The postage stamp problem is a mathematical riddle that asks what is the smallest postage value which cannot be placed on an envelope, if the latter can hold only a limited number of stamps, and these may only have certain specified face values. For example, suppose the envelope can hold only three stamps, and the available stamp values are 1 cent, 2 cents, 5 cents, and 20 cents. Then the solution is 13 cents; since any smaller value can be obtained with at most three stamps (e.g. 4 = 2 + 2, 8 = 5 + 2