Ok thats a Euro car. Their is no reason it wouldn't be an 85, the W124 came out in Europe in 1985. Remember they get MB's one year before us.
For ordering parts it is a basic W124, tell the less eduacted parts guys its an 86 when ordering anything for the car. However the good parts guys and dealer should be able to figure it out.
Other then that congrates it looks like a really good example!
I don't know why the vin is wrong, maybe when they imported it they did something funny to get it in this country.