I have a PP that I bought a few years ago. It is in the original box with a safety manual and one extra clip. It has markings on the slide and frame that seem I can't figure out, and hoped this forum would help. On the slide, from the muzzle to the rear, AB over 9 in a circular wreath; the letters "ac" over 1001 over ZELLA-MEHLIS, GERMANY; 765 over an eagle over a crown N proof. The frame is stamped with an eagle over a crown N proof under the mag release; the importers stamp(G.P. Trading, St. Alb.VT); and A.B. over 70 in a circle of dots on the rear of the frame. On the other side of the frame, under the SN is HAMMERLI over TIENGEN. The pistol is in 98+ condition, was supposed to be a police trade in and came with a holster(long gone). Any help on the stamps would be appreciated.