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2. List of most expensive philatelic items - Wikipedia

   en.wikipedia.org/wiki/List_of_most_expensive...

   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. [1] [2] This list is ordered by consumer price index inflation-adjusted value (in bold) in millions of United States dollars in 2024.

3. Bulla (seal) - Wikipedia

   en.wikipedia.org/wiki/Bulla_(seal)

   A bulla (or clay envelope) and its contents on display at the Louvre. Uruk period (4000–3100 BC).. A bulla (Medieval Latin for "a round seal", from Classical Latin bulla, "bubble, blob"; plural bullae) is an inscribed clay, soft metal (lead or tin), bitumen, or wax token used in commercial and legal documentation as a form of authentication and for tamper-proofing whatever is attached to it ...

4. First-price sealed-bid auction - Wikipedia

   en.wikipedia.org/wiki/First-price_sealed-bid_auction

   A first-price sealed-bid auction (FPSBA) is a common type of auction. It is also known as blind auction. [1] In this type of auction, all bidders simultaneously submit sealed bids so that no bidder knows the bid of any other participant. The highest bidder pays the price that was submitted. [2]: p2 [3]

5. History of United States postage rates - Wikipedia

   en.wikipedia.org/wiki/History_of_United_States...

   However, this legislation was set to expire in April 2016. As a result, the Post Office retained one cent of the price change as a previously allotted adjustment for inflation, but the price of a first-class stamp became 47 cents: for the first time in 97 years (and for the fourth time in the agency's history) the price of a stamp decreased. [32]

6. Seal of the president of the United States - Wikipedia

   en.wikipedia.org/wiki/Seal_of_the_president_of...

   The information on Fillmore's seal is from an 1885 article in the Daily Graphic, and (according to Daniel S. Lamont, the private secretary to Grover Cleveland and one of the article's sources) the 1850 seal was still in use at that time and was used to seal envelopes sent to either house of Congress. The article claims that Stabler made two ...

7. Postage stamps and postal history of the United States

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

   On April 12, 2007, the Forever stamp went on sale for 41 cents, and is good for mailing one-ounce First-Class letters anytime in the future—regardless of price changes. On the same day, the Postal Service also issued an American flag stamp with the text "USA First Class", whose value is fixed at 41 cents. [ 63 ]