You're very welcome Jean-Luc, Im glad I could offer some useful info, and thank you for the great image of the stamp at forte. I will work at getting scans of the Wagner pages and enter them here.
Fernando K nicely done on identifying the mark!!!! I guess it was an M after all
I dont have that catalog, only the Palomares plate from Calvert.
Jean-luc looks like you were already pretty much spot on when you posted this, and the blade is indeed about mid 16th century. As I mentioned earlier this seems to have been refurbished in the 17th century and quite likely was shortened at that time, as was often the case as arms were often reworked to supply troops.
Outstanding historical piece reflecting a sturdy working life! and interesting to see this makers stamp on a Solingen blade, though of course numerous Spanish makers stamps were copied in these times.