Thanks for the info. I believe I may have gotten my shipwrecks mixed
I just recently saw three 1857-S double eagles from the S.S. Central
America in a Stack's Rare Cins auction lot viewing. Though I did not
look closely, at a glance they appeared to be in great condition.
PCGS agreed, giving them MS66 and 67 grades.
I've already forgotten. Which wreck was it that caused all of the
concern over "cleaning" because they had to get the coins out of a lot
of encrustation that built up over the years? *Those* are the coins I
can't accept as still being MS.
If it's the S.S. Central America then I need to look at those coins
again, very carefully, through a 10x loupe. If I can't see *any*
indication of them being underwater, i.e., corrosion, etc., then I
need to change my tune and accept that these coins are still MS.
Uncirculated, no....Mint State, yes. :-)
>>The SS Central America coins show little of this. Reaction at
>>a depth of 8000 feet where water temperature is 34F is very slow.
>>The principal damage to shipwreck gold is a sandblast effect caused
>>by water current friction. Such coins would not be graded MS.
>>These were not exposed to such currents.