I think the three varieties they're referring to are the first reverse (8 tail feathers(, second reverse (parallel top arrow feather, concave breast), and the third reverse (slanted to arrow feather, convex breast). There is actually a fourth reverse marked by doubled tail feathers.
I'm at MS62 tops based on all the friction/contact marks on the cheek and here's a good breakdown of the varieties (VAMs)- http://www.vamworld.com/78+CC+4th+Star+and+MM
Hmmm similar surface with a bit more luster. I like yours better especially for the price. I think I over paid at $460