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  2. Professional Sports Authenticator - Wikipedia

    en.wikipedia.org/wiki/Professional_Sports...

    PSA later refused to re-grade the card, as any result—whether confirming or contradicting the original PSA 10—would expose their prior misrepresentation. The buyer was refunded by the seller, but the seller—who had relied on PSA’s authentication—never recovered the nearly $1 million value of the card (Id., ¶¶ 72–106).

  3. 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 ...

  4. Numismatic Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Numismatic_Guaranty_Company

    Even within the same grade, coins can have widely differing values. In the May 26, 2003 edition of Coin World , the hobby newspaper had announced they had contracted investigators to conduct a year-long, comparative study of PCGS , ACCGS , and NGC, along with several other grading services, each known as Third Party Grader (TPG).

  5. Collectors Universe - Wikipedia

    en.wikipedia.org/wiki/Collectors_Universe

    Collectors Universe Inc. is an American company formed in 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles.

  6. Pacific Southwest Airlines Flight 1771 - Wikipedia

    en.wikipedia.org/wiki/Pacific_Southwest_Airlines...

    Pacific Southwest Airlines Flight 1771 was a scheduled domestic passenger flight from Los Angeles, California, to San Francisco.On December 7, 1987, the British Aerospace 146-200A, registration N350PS, crashed in San Luis Obispo County near Cayucos, [3] [4] after being hijacked by a passenger.

  7. Professional Coin Grading Service - Wikipedia

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

    Professional Coin Grading Service (PCGS) is an American third-party coin grading, authentication, attribution, and encapsulation service founded in 1985. The intent of its seven founding dealers, including the firm's former president David Hall, was to standardize grading.

  8. High-grade prostatic intraepithelial neoplasia - Wikipedia

    en.wikipedia.org/wiki/High-grade_prostatic...

    Nowadays, PIN 1 is referred to as low grade PIN, and PIN 2 and PIN 3 are grouped together as high grade PIN. [10] Only high grade PIN has been shown to be a risk factor for prostate cancer. Because low grade PIN has no significance and does not require repeat biopsies or treatment, it is not mentioned in pathology reports. As such, PIN has ...

  9. Public Schools Association - Wikipedia

    en.wikipedia.org/wiki/Public_Schools_Association

    The PSA invited Wesley College to join in 1952, followed by Christ Church Grammar School in 1956 and Trinity College in 1968. [2] The presidency of the PSA is held by the principal of the "host school" which rotates annually among member schools. To celebrate the centenary of the PSA in 2005, every student of the PSA was given a commemorative pin.