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  2. War savings stamps of the United States - Wikipedia

    en.wikipedia.org/wiki/War_savings_stamps_of_the...

    The primary, interest-earning stamp issued was the War Savings Certificate stamp, which was worth 5 dollars at maturity on January 1, 1923. These stamps needed to be affixed to an engraved folder called the War Savings Certificate, which carried the name of the purchaser, and could only be redeemed by that individual.

  3. Postage stamps and postal history of Azerbaijan - Wikipedia

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Mail carriers in Baku, 1914. The postage stamps and postal history of Azerbaijan describes the history of postage stamps and postal systems in Azerbaijan, which closely follows the political history of Azerbaijan, from its incorporation to the Russian Empire in 1806, to its briefly obtained independence in 1918, which it lost to the Soviet Union in 1920 and re-acquired in 1991 after the ...

  4. Revenue stamps of the United States - Wikipedia

    en.wikipedia.org/wiki/Revenue_stamps_of_the...

    The first revenue stamps in the United States were used briefly during colonial times, among the most notable usage involved the Stamp Act.Long after independence, the first revenue stamps printed by the United States government were issued in the midst of the American Civil War, prompted by the urgent need to raise revenue to pay for the great costs it incurred.

  5. Postage stamp color - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp_color

    Nearly all stamps get their color from inks printed on white or light-colored paper; the handful of exceptions include early issues of Natal consisting only of embossing on colored paper, [1] some recent stamps embossed on gold foil or with foil blocking to achieve a metallic appearance, and the Uganda Cowries produced on a typewriter.

  6. Postage stamps and postal history of the Orange Free State

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    The first Orange Free State stamps were issued in 1868. The sole design used was an orange tree, with the inscription "Oranje Vrij Staat" in the margin. The stamps were typographed by De La Rue and Company, and came in denominations from one penny to five shillings, in various colours.

  7. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

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