Case in point is
this Heritage Auction which closed a few days ago.
What exactly happened here? Auction description states:
Quote:
Elizabeth II Dollar 1966 Large Beads, KM64.1, MS66 PCGS, deeply toned, especially on the obverse. Very scarce in this lofty designation.

PCGS correctly identified this as "large beads". The problem here is the "very scarce" version is the
small beads, which isn't this coin at all. As shown, who really thinks the grade of this particular coin is "very scarce"? See pics below; I'm baffled.
A. is the badly toned/dinged coin from this auction, and B. is a genuine "small beads" $1--a truly scarce coin. Such as it is, somebody paid
$1092 for a toned "MS66" coin with
big dings around the rim, no less. This is a
common coin, and I'm not sure this "lofty" one even qualifies for
MS 

Some more "MS66" details. This coin is
circulated--or very close. (imo)

