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2. Upper Deck Company - Wikipedia

   en.wikipedia.org/wiki/Upper_Deck_Company

   Many Griffey cards were returned and the result was that Upper Deck printed many uncut sheets (sheets consisting of 100 cards) of just the Griffey card. [28] According to Professional Sports Authenticator (PSA), the Ken Griffey Jr. card would become the most graded card of all time with the company; PSA graded over 50,000 of the cards. The ...

3. Professional Sports Authenticator - Wikipedia

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

   PSA was launched in July 1991 by David Hall, owner of the coin grading company Professional Coin Grading Service (PCGS), to serve collectors as a third-party card grader. [1] At the outset, the business faced difficulties owing to a limited demand from collectors who sought card grading services. [2] Initially, many sports card dealers were ...

4. Collectors Universe - Wikipedia

   en.wikipedia.org/wiki/Collectors_Universe

   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. Its authentication services focus on coins, trading cards, sports memorabilia, and autographs.

5. List of most expensive sports cards - Wikipedia

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

   Thus, for example, the T206 Honus Wagner is represented on this list by one particular card's 2021 sale and does not include the same card's 2012 sale for $1.2 million or the Jumbo Wagner and its $3.12 million sale price. Cards are evaluated by third-party services, most often Professional Sports Authenticator (PSA), Beckett Grading Services ...

6. Apollo 15 postal covers incident - Wikipedia

   en.wikipedia.org/wiki/Apollo_15_postal_covers...

   Apollo 15. The Apollo 15 postal covers incident, a 1972 NASA scandal, involved the astronauts of Apollo 15, who carried about 400 unauthorized postal covers into space and to the Moon's surface on the Lunar Module Falcon. Some of the envelopes were sold at high prices by West German stamp dealer Hermann Sieger, and are known as "Sieger covers".

7. Boeing P-8 Poseidon - Wikipedia

   en.wikipedia.org/wiki/Boeing_P-8_Poseidon

   The Boeing P-8 Poseidon is an American maritime patrol and reconnaissance aircraft developed and produced by Boeing Defense, Space & Security, and derived from the civilian Boeing 737-800 airliner. It was developed for the United States Navy (USN). The P-8 operates in anti-submarine warfare (ASW), anti-surface warfare (ASUW), and intelligence ...