Rotated die Morgan,any info would help.

Just bought a 1901-o Morgan dollar with a rotated reverse at between 80 to90%, in about Fine15. I can't seem to find much info on it. In an old copy of the Vams book,they have a list of Morgans that are most commonly found like this,but no 1901's. Can any body shed any light on how common,or rare,and what it might be worth?
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OK,need some help here people.In the post above,by 80 to 90%,I meant 80 to 90 degree counter clock wise.
Any help?
Thank You very much Rainbows.