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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 2023.

  3. Low-background steel - Wikipedia

    en.wikipedia.org/wiki/Low-background_steel

    Low-background steel, also known as pre-war steel [1] and pre-atomic steel, [2] is any steel produced prior to the detonation of the first nuclear bombs in the 1940s and 1950s. Typically sourced from ships (either as part of regular scrapping or shipwrecks ) and other steel artifacts of this era, it is often used for modern particle detectors ...

  4. List of military headstamps - Wikipedia

    en.wikipedia.org/wiki/List_of_military_headstamps

    The original Ball bullets made in 1942 had Gilding-Metal-clad jackets and the later Alternate Ball versions made from 1943 to 1944 had Gilding-Metal-Coated-Steel (GMCS) jackets. The Chinese numbers 七 ( Qi , or "7") over 九 ( Jiǔ , or "9") at the 9 o'clock position represent the bullet's caliber (7.9mm).

  5. Undetectable Firearms Act - Wikipedia

    en.wikipedia.org/wiki/Undetectable_Firearms_Act

    The United States Undetectable Firearms Act of 1988 (18 U.S.C. § 922(p)) makes it illegal to manufacture, import, sell, ship, deliver, possess, transfer, or receive any firearm that is not as detectable by walk-through metal detection as a security exemplar containing 3.7 oz (105 g) of steel, or any firearm with major components that do not generate an accurate image before standard airport ...

  6. PCS Stamps & Coins - Wikipedia

    en.wikipedia.org/wiki/PCS_Stamps_&_Coins

    In short, it's the world's largest company dedicated to the collection of stamps, coins, and other related items. [1] Products include collectibles that contain U.S. silver dollars, other historic U.S. coins, State Quarters, mint condition U.S. stamps, and U.S. paper money. [2] They have a 30-day unconditional return policy.

  7. Postage stamp paper - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp_paper

    A sheet of National Telephone Company postage stamps. Postage stamp paper is the foundation or substrate of the postage stamp to which the ink for the stamp's design is applied to one side and the adhesive is applied to the other.

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