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if it's at all possible to grade a coin from just a photo?
The good auction sites use dedicated setups with the right lens / lighting etc which helps.
Others on here know a lot about that. To your Q: Probably not.
Big money coins seldom go just on a photo, they have live floor bidders who've inspected the coin, and seriously big money coins - the seller will often fly the coin across the country to you and knock on your door to try and make the sale..
For me the coin brainwork is basically:
$1-50 - yeah whatever click buy .. uh oh what have I done?
$50-250 - think about that, send seller questions, look at his pics on big screen and use photoshop filter to see as much as possible.
$250-1000 - ask on forums, be very careful : sometime win, sometimes lose
$1000 up - I usually can't afford it, but have a handful.
$10,000 up - Maybe when I win powerball
Scans are popular too, but the results look a bit weird, okay for cheap stuff.
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able to give you an indication of what they thought the grading would be?
That threepence (doubts aside for now) is AU58-MS62
In MS grades, sought after coins can double in value for each step of the MS ladder, which might explain why many coin owners resubmit the same coin several times. PCGS and NGC often see the same coin come back ..
An auction is only good for the seller if there's a fight - which means two people who have money and really want the auction lot.
Some coins have never achieved a certain grade as with this thing - no MS65 1923 threepences exist and getting one would be nice (and unique).
The coin here has no chance at all at high MS, it's not a particularly good strike. I liked it because unc 23's are hard to find.
It's easy to get a MS grade on a modern coin or a coin with an enormous mintage, but key Australian predecimal dates are often nightmarishly hard to find in these grades.
Cheers