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  2. Postage stamps and postal history of El Salvador - Wikipedia

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

    From 1620 to 1748 the postal rates in effect to be paid on receipt of a letter in Central America were 2 reales for a single letter, 4 reales for a double letter (i.e. a letter folded eight-ply, but not thicker than a finger), 8 reales for letters two to six fingers thick, and 2 to 3 pesos for a thicker letter. In 1749, the so-called efinger ...

  3. Postage stamp problem - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp_problem

    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 + 1, etc.), but to get 13 cents one must use at least four stamps.

  4. Postage stamps and postal history of Hong Kong - Wikipedia

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

    [1] [2] Between 1841 and 1862, no stamps were issued, and postmarks were used to certify payment of the postage instead. [3] [4] The earliest postmarks were used by military field offices, and read "MILITARY POST OFFICE CHINA" (c. 1842) and "MILITARY POST OFFICE HONG KONG" (1841–1842). An assortment of postmarks were used for civilian ...

  5. Postage stamps and postal history of Greece - Wikipedia

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

    It consisted of the following values: 1 lepton, 2, 3, 5, 10, 20, 25, 30, 40 and 50 lepta, 1 drachma and 2, 3, 5, 10 and 25 drachmae. It was printed by Aspiotis Bros. using the lithographic process. The stamps were printed on two types of paper, smooth and rough, with perforation 13½. These stamps were occasionally also used in Greece proper.

  6. Black Jack (stamp) - Wikipedia

    en.wikipedia.org/wiki/Black_Jack_(stamp)

    Black Jack or Blackjack was the 2-cent denomination United States postage stamp issued from July 1, 1863 to 1869, is generally referred to as the "Black Jack" due to the large portraiture of the United States President Andrew Jackson on its face printed in pitch black. [1] It is considered to be a key stamp in any collection of US stamps. [2 ...

  7. Postage stamps and postal history of Greenland - Wikipedia

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

    In 1938, postal service was established and the first postage stamps of Greenland were issued on 1 December. The series consisted of five stamps with a portrait of the Danish king Christian X and two with the image of a polar bear. [1] [2]

  8. List of postage rates in Australia - Wikipedia

    en.wikipedia.org/wiki/List_of_postage_rates_in...

    [3] [4] [5] On 26 December 2013, due to the heavy decline in mail usage due to competition from email, etc., Australia Post requested an increase in the base rate to 70c. [6] On 4 January 2016, due to the heavy decline in mail usage due to competition from email, etc., Australia Post requested an increase in the base rate to $1.00. [7] On 1 ...

  9. Grandi's series - Wikipedia

    en.wikipedia.org/wiki/Grandi's_series

    (4) the result is ⁠ 1 / 2 ⁠ (3) the result is 1 (2) the result is infinite (30) no answer. The researcher, Giorgio Bagni, interviewed several of the students to determine their reasoning. Some 16 of them justified an answer of 0 using logic similar to that of Grandi and Riccati. Others justified ⁠ 1 / 2 ⁠ as being the average of 0 and 1 ...

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