Robert: How dare you buy up all the guns that should be mine!!!
Good find. There are other anomolous guns floating around, ie: A Mle 92 with un-numbered bolt and mag and stock, it does not have a tenon du recul either, and the un-marked stock, apparently a spare part, has no provision for the tenon, like yours, what is even more strange is the swivel on the butt, still intact and the clearing rod still stuffed into the stock!
The early sear is still on the dog, and the sight is converted to MD, but not marked.
I am fairly sure that the authorities did not seriously begin to add the tenon until the 1930's rebuild program. All the observed guns are dated in the 30's, and the work to do this modification was extensive to say the least..