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The gallery of passport stamps by country or territory contains an accurate alphabetical list of sovereign states, partially recognised states, and dependent territories with images of their passport stamps including visas. All Schengen countries and Cyprus use the same format for their stamps and stamps are not issued when traveling from one ...
Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...
This is a list of the highest known prices paid for philatelic items, including stamps and covers. The current record price for a single stamp is US$9,480,000 paid for the British Guiana 1c magenta. This list is ordered by consumer price index inflation-adjusted value (in bold) in millions of United States dollars in 2023.
International reply coupon. An international reply coupon (IRC) is a coupon that can be exchanged for one or more postage stamps representing the minimum postage for an unregistered priority airmail letter of up to twenty grams sent to another Universal Postal Union (UPU) member country. IRCs are accepted by all UPU member countries.