Question?

Discussion in 'Coin Chat' started by DarkRage666, Dec 2, 2020.

  1. DarkRage666

    DarkRage666 Procrastinator

    How do the grading companies grade coins? What tactics do they use? What instruments do they use?
     
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  3. Conder101

    Conder101 Numismatist

    Eyes, consistent lighting, sometimes a low power loupe, knowledge and experience.
     
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  4. furham

    furham Good Ole Boy

    #1
     
  5. -jeffB

    -jeffB Greshams LEO Supporter

    Don't forget "marketing". :rolleyes:
     
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  6. Penny Luster

    Penny Luster Supporter! Supporter

    Back in the days Before Covid (BC) there were large coin shows and PCGS
    used to have coin grading seminars. I hope to go to one someday. I have learned a bit about it from a couple of the PCGS PowerPoint presentations on youtube.
    https://www.youtube.com/c/PCGScoin

     
    Last edited: Dec 2, 2020
  7. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    Don't you mean "market grading"?
     
  8. paddyman98

    paddyman98 Let me burst your bubble! Supporter

    They also Attribute Mint Errors and Varieties with the same techniques mentioned before. I saw a picture over at NGC where they have a library of reference books for use in attribution.
    And one important factor is talking with their co-workers for verification of the attribution.
     
    Last edited: Dec 2, 2020
  9. tommyc03

    tommyc03 Senior Member

    Maybe @Insider would like to chime in on this one?
     
  10. Insider

    Insider Talent on loan from...

    DarkRage666, asked: "How do the grading companies grade coins? What tactics do they use? What instruments do they use?

    Too broad a question. Tactics? Some graders start from the back of the box. I use a 7X hand lens and stereo microscope (mostly at 7X). I also us two different light sources, rarely a specific gravity rig, and conservation stuff. Otherwise:

    Conder101, posted: "Eyes, consistent lighting, sometimes a low power loupe, knowledge and experience.
     
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  11. paddyman98

    paddyman98 Let me burst your bubble! Supporter

    @DarkRage666
    Here is a YouTube video showing the process at NGC with a shot of the books.
     
  12. DarkRage666

    DarkRage666 Procrastinator

    That's cool thanks for that!
     
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  13. Kentucky

    Kentucky Supporter! Supporter

    merchantizing.jpg
     
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  14. Insider

    Insider Talent on loan from...

    Did anyone notice that on occasion a coin is looked at again while still in the flip. That simulates how it may look in the plastic slab.
     
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  15. Kentucky

    Kentucky Supporter! Supporter

    [​IMG]
     
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  16. MIGuy

    MIGuy Supporter! Supporter

    At HGC they use magic (Hogwarts Grading Company) but it's really trixie and those leprechaun coins can up and disappear in a second if you don't have the room sealed properly.
     
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  17. gmarguli

    gmarguli Slightly Evil™

    I was told that in the bulk department at one TPG, when someone submits the fresh from the mint stuff like commems and proof Eagles, they don't even take them out of the mint capsule to grade them. They get removed from the capsules later in the process, before holdering them.
     
  18. Insider

    Insider Talent on loan from...

    Depends on who told you that and what company they work for. I have it on very good authority that at one major service they flip any of the "liners" to see if it gets the higher grade. ;)
     
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