All Morgan dollars
are VAMs (die pairing by known obverse and reverse dies).
A specific rotation on a coin is not a VAM
in itself, all coins could concievably have rotation. Morgan dollars
are pretty hard to find with more than 5% rotation, and any more than that will bring a good premium generally. I've seen a few 15%-180% they usually bring at least $100.00+ over the value of the grade and date the more the rotation the higher the price asked is generally the rule.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA
Life Member #3288 in good standing since 1982, EAC Member #6202, NBS Member, 2¢ variety collector.
See my want page: http://goccf.com/t/140440