It is a .32. I didn't notice any letters but I have someone who's gonna send me a couple of pics to show any other markings. I should've done that when I looked at the gun. D'OH!A starting point would be to know whether it was manufactured in Zella-Mehlis or Ulm? Is there letter in the vicinity of the serial? I presume it is marked 7.65mm (.32 ACP), or is it 9mm Kurz (.380 ACP) or .22 LR? Any other markings?