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 Replies: 12 / Views: 3,557 |
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Moderator
 United States
56855 Posts |
Just wondering if the TPG's grade each coin by human eye or is there a machine that does it? These TPG's grade a whole lot of coins each year. John1  |
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Moderator
United States
16679 Posts |
PCGS graders grade tens of thousands of coins each year.
I was advised that no more than 3 seconds per grader, per coin, is paid attention to each submission. No gloves worn..just bare hands on edges.
All human, no machine although there is a finalizer.
swcoin.ecrater.com
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Pillar of the Community
United States
1339 Posts |
When will the flow of new material to grade dry up ? Great question JOhn1!
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Pillar of the Community
United States
7390 Posts |
If you want a little history lesson lookup "compugrade" they tried their best to use "state of the art" 90s computer and imaging tech to grade coins
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Rest in Peace
United States
18456 Posts |
Quote:
All human, no machine although there is a finalizer. Who or what is the finalizer ? |
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Pillar of the Community
United States
4809 Posts |
I suspect it's the narrow part of the funnel: a person or group of persons (small) that take the broader assessments and validate them from all the graders (larger population). If there is a grader that over/under grades a coin consistently, they are targeted for additional training to reduce the variation between graders.
The odds that both the grader and the finalizer botch a grade are reduced with the double appraisal. However, there is inherent issues with 200% inspection. First guy thinks the second guy will do it, the second guy figures the first guy will do it. Ends up being 80% effective. Both roles must be distinct in order for a process like the one described to work consistently.
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Pillar of the Community
 United States
4593 Posts |
Actually, it's usually described by outsiders (incorrectly?) as "several graders" independently and then a finalizer in the event of disagreements. But let's go to the equine's oral orifice... PCGS http://www.PCGS.com/thePCGSstory):Quote:
Grading Room
The PCGS grading room is home to many of the world's most knowledgeable and experienced numismatists. Each expert works independently in a controlled environment which provides optimum conditions for studying the characteristics and physical condition of each coin. A series of graders enters independent determinations in a computer database until a consensus is reached and the final grade assigned. In addition to their high level of training, graders rely on our comprehensive grading sets of U.S. and international coins to supplement PCGS's grading standard. NGC ( https://www.NGCcoin.com/coin-gradin...g-process/):Quote:
Grading is a team effort, with at least two professional numismatists examining every coin. To maintain impartiality, NGC's coin graders cannot be involved in the commercial buying and selling of coins. Each coin is examined by one NGC coin grader at a time, who enters the coin grade into the system. -----Burton 50+ year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club Owned by three cats and a wife of 40+ years (joined 1983) Author: 3rd Edition of the Sample Slabs book, https://www.sampleslabs.info/ |
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Rest in Peace
United States
17900 Posts |
NGC has a video of the process. Man, they grade FAST.
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Moderator
United States
16679 Posts |
3 graders and a final grader who reaches the ultimate grade that will go on the holder. It's consensus. Then off to a quality control room before coin(s) are sent back to submitter.
swcoin.ecrater.com
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Valued Member
United States
311 Posts |
Sometimes they grade pretty hard, but they have been utilizing this system for a very long time and have had a lot of experience doing it. Can you imagine seeing as many coins come through as these people do? I think it might end up being a double edged sword... too many coins and they could either be burnt out and miss details, or they could have really trained eyes that can tell the difference between a 69 and a 70
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Pillar of the Community
United States
5854 Posts |
Each coin is graded by a person but in recent years some of the responsibilities have been turned over to machines. The responsibility of detecting doctored coins used to fall on the graders but now coins submitted under PCGS secure go through their "sniffer" to weed out the doctored coins.
Each coin is looked at by at least 2 graders with a 3rd grader utilized when there is a disagreement in grades assigned or concerns of authenticity by the first 2 graders. I heard a former PCGS grader say that it took him around 30 seconds per coin and sometimes up to a minute to authenticate, grade, and enter everything into the computer. I think he said that when it came to major rarities, the graders may take as much time as they like. These seem to be supported by the data provided by PCGS. In the last 12 months, they graded 2,147,035 coins. According to Collectors Universe's 10k, they employed 24 graders as of 6/30/15. Let's assume each grader works 8 hours/day for 252 days/year and each coin gets looked at on average 2.5 times. The average number of coins graded per day is about 8520(2147035/252). The number times all 8520 coins will be be looked at is about 21300(8520*2.5). Assuming each grader looks at the same number of coins, each person will look at about 887.5 coins/day (21300/24) which would equate to about 111 coins/hour(887.5/8).
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Pillar of the Community
United States
4593 Posts |
Experienced coin graders work no more than 4h / day. You need to double your #s. Which brings us to what? 220/h or 15s per...
-----Burton 50+ year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club Owned by three cats and a wife of 40+ years (joined 1983) Author: 3rd Edition of the Sample Slabs book, https://www.sampleslabs.info/ |
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Pillar of the Community
United States
5854 Posts |
Hmm... didn't know they only work 4hrs/day.
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Replies: 12 / Views: 3,557 |
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Posted 01/26/2016 06:05 am
