It's a WW2 Mauser Parabellum/Luger manufactured by Mauser in 1942. 42 on the chamber for 1942. byf on the toggle for the three letter code, secret, for P.08 mfg by Mauser.
Might have wood grips or bakelite/plastic grips. Might have a fxo marked magazine. If in good condition, should be an excellent pistol, late military production.
Just a newbie myself, will bow out for the experts.
BTW, do you like Reyes cigars?