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  2. Professional Coin Grading Service - Wikipedia

    en.wikipedia.org/wiki/Professional_Coin_Grading...

    PCGS certified 1904-O MS 63 in a coin slab. The PCGS holder, or a Coin slab which is made of clear, inert plastic and is stackable. Anti-counterfeiting measures include a hologram on the back, markings within the holder, and Near Field Communication (NFC) chip embedded in some holders. [10]

  3. Coin slab - Wikipedia

    en.wikipedia.org/wiki/Coin_slab

    Reverse of PCGS coin slab with hologram in upper right corner. Slabbing coins is a practice which began in 1986. The grading of coins was a way to remove coin grading controversies by having a third party certify the coin's condition. [1] The earliest coin slabs introduced by PCGS were in use from 1986-1989.

  4. Third-party grading - Wikipedia

    en.wikipedia.org/wiki/Third-party_grading

    Third-party grading (TPG) refers to coin grading & banknote grading authentication, attribution, and encapsulation by independent certification services.. These services will, for a tiered fee depending on the value of the coin, "slab" a coin and assign a grade of 1–70 on the Sheldon grading system, with 1 being the lowest grade, with only faint details visible to 70, a practically perfect ...

  5. Coin grading - Wikipedia

    en.wikipedia.org/wiki/Coin_grading

    Coin grading [1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted.

  6. Certified Acceptance Corporation - Wikipedia

    en.wikipedia.org/wiki/Certified_Acceptance...

    The firm evaluates certain numismatically valuable U.S. coins already certified by Numismatic Guaranty Corporation (NGC) or Professional Coin Grading Service (PCGS). [1] [2] Coins that CAC deems high-end for their grades receive green stickers, [3] which usually add premiums ranging from single digit percentages to 92% or more.

  7. Sheldon coin grading scale - Wikipedia

    en.wikipedia.org/wiki/Sheldon_coin_grading_scale

    The scale used today is a modification of the original Sheldon scale, with added adjustments, additions, deletions, and modifications to it. [4] [5] Note: Some early American coin varieties are almost always found to be weakly struck in places. This does not bring the grade of these coins down as in some cases no flawless coin exists for the ...

  8. Saint-Gaudens double eagle - Wikipedia

    en.wikipedia.org/wiki/Saint-Gaudens_double_eagle

    In spite of the modifications, according to R.S. Yeoman in his A Guide Book of United States Coins, many consider the Saint-Gaudens double eagles the most beautiful of U.S. coins. [42] In his book discussing the redesigns of U.S. coins between 1905 and 1908, Burdette casts blame on all parties for the delays in the new coin:

  9. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    NMRA standard S-1.2 covers the popular model railway scales and S-1.3 defines scales with deep flanges for model railways with very sharp curves or other garden railway specific design features. In certain NMRA scales an alternative designation is sometimes used corresponding the length of one prototype foot in scale either in millimetres or in ...