VAM is what a variety designation for Morgan or Peace dollars is called. It's after the book on these coins written by Van Allen and Mallis. See http://www.vamworld.com/VAM
When coins are minted there's a obverse die and a reverse die. Each die has its own finger print so to speak. When collectors talk about Vams or die marriages what they are doing is matching up the two dies that minted the coin. Since die's do wear out and break sometimes different dies were used. So when you're looking for a vam or die marriage you're trying to use certain pick up points so you can ID the two dies used to mint a certain coin. If you're interested Google vam world. Lot's of good information as well as pictures .
Given all the resources (and the fact that you can have a member VAM designate for $6) available for VAMs, why not attribute your guess (take all the effort of staring at screens and comparing on yourself), then ask the forum their opinions on your accuracy? Grades, I'd say AU 53 and MS details or MS 62, depending on how much the huge divots look like scratches or bagmarks.
Well, @Cascade , here's your big chance.... You've seen enough of my sorry images to get these right, right??
(1902-O): MS 64 ...in my opinion, this looks like one of those cases where the obverse is better than the reverse and carries the grade (1888): MS 63
64 each due to strike alone by today's standards. Plus there's too much chatter on the cheek of the 02o for 65 anyway. The 88p looks to be old anacs maybe so a 65 label is possible. Too tired to vam right now plus with those dates it could be tuff with those pics