I just glanced at the Sporting Rifle book and forgot to check the Mauser Archive book. Old age kicking in.
I am terribly unorganized right now after a move and its hard to find all my Mausers but it seems this one has a different floorplate than I remember on any of the other 10.75's or 9.3's that I own. All I have at hand to compare with are some smaller caliber guns and my memory is far from perfect so it very well may turn out the floorplate on this 10.75 is the same as my other 10.75 guns.