Your pistol was manufactured by FN @ Herstal, Belgium...post occupation, using parts produced during the German occupation...hence, the FN factory "A" prefix (signifying "Allemande" meaning "German" in French) Serial Number...in 1945 as part of the first post-occupation Belgian Military contract. The "B" suffix was added at the Belgian Military Arsenal in order to signify "Belgique" meaning Belgium in French. It was intended that the combination of the original pre-existing "A" (Allemande) prefix with the subsequently added "B" (Belgique) suffix would designate "Armee Belgique"...meaning "Belgian Army" in French, ownership. Obviously, French was/is FN's official language. Once FN used-up the existing occupation parts inventory, they dropped the factory "A" prefix and started numerical only serial...and contract, numbers once more, forcing subsequent Belgian Military contract pistols to have "AB"...and other ownership designating letter combinations, added to the serial number. Nice pistol :mrgreen:. Leather or canvas full flap holster?