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Which Price Guide is most accurate?

It seems like a huge task to get it right for all coins all the time. Is it possible? What about low pop/high end items that don't trade often or trade privately?
It might be open for abuse, but what about a "wiki-priceguide", where hundreds of members can enter data on sales? Other thoughts?
Jack
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PCGS price guide showed $150, and I almost jumped on it, until I look at eBay completed, and saw another one selling for only $102.
I also (on eBay) saw a super low grade (AG-3) Colombian Expo sell for (gasp) $300! PCGS Price guide: $15.
IMO, your half-nuts to spend $300 on a AG-3 Expo half, but then again, I guess the person wanted this for a low-ball set.
So we have one coin PCGS sez is worth $150, selling for $102 on eBay, and we have one that they say is worth $15, selling for $300.
Not the best, but a good example of how price guides are not the best.
Price guides don't always take into consideration things like "monster toning",die cracks, etc.
I think eBay completed auctions are a good source for determining a good value.
<< <i>It seems like a huge task to get it right for all coins all the time. Is it possible? What about low pop/high end items that don't trade often or trade privately?
It might be open for abuse, but what about a "wiki-priceguide", where hundreds of members can enter data on sales? Other thoughts?
Jack >>
I agree that it is a problem. The best price guide is the one I have in my head. Second to that, I like CoinFacts, as it compiles auction information (which is not necessarily relevant to all collectors and coins) and private sales.
A wiki-guide would theoretically be excellent, but without verification, it could be easily abused and used as a tool for price manipulation.
The perfect price guide is one of the holy grails of the hobby.
Two coin collectors I know only use the greysheet, and leave most auctions empty handed, I wonder why...
Greysheet might be fine and dandy if your a dealer, and buying wholesale lots, or something, but for a collector, it's the worst price guide, IMO.
I feel your pain re the coins that trade infrequently--never guided high enough if they are nice.
But DH does a great job of getting them current after auction sales, and dealer transactions.
Before such occurs, you almost have to guess, and an auction may be required. When the last sale is 10 years ago,
and the coin is in the top 5 grade-wise, and more than one collector wants it bad, the next price may be
more than twice the last one. Add some wow color and the sky is the only limit.
I do not remember when the 1884 and 85 Trade dollars last went to auction. Or when the 93-S morgan in 67 traded.
PCGS gets us current pricing better than any other source.
But for the majority of coins that aren't traded like that there are way too many variables to lock a coin to a price.
https://pcgs.com/setregistry/showcase/2819
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Thanks for the great replies.
TahoeDale, you really articulated one of my main points. For truly rare items, it really comes down to what the market will bear. However, when those items trade hands, the transactions are often not acknowledged in the "price guides".
Thanks, Joey. I will try to find the thread.
Jack
They are just guides.
Eric