Steve, I believe that is a pattern which is often, if not usually found with a "wood-grain" effect to the color. I think the surfaces are probably ok but that you are seeing the typical, uneven color/toning pattern (no pun intended).
Edited to add: I still wouldn't recommend that someone buy it (or other high priced coins) uncertified, unless there is a full return privilege offered by a well known, reputable seller AND the buyer is expert.
Emailed the seller when it was first listed - he says the reverse picture is the more representative color of the entire coin.
Gone but not forgotten: IGWT, Speedy, Bear, BigE, HokieFore, John Burns, Russ, TahoeDale, Dahlonega, Astrorat, Stewart Blay, Oldhoopster, Ricko, Big Moose, Cardinal, CoinsAreFun.
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Edited to add: I still wouldn't recommend that someone buy it (or other high priced coins) uncertified, unless there is a full return privilege offered by a well known, reputable seller AND the buyer is expert.
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
Glenn
K S