English: The HK 4 pocket pistol was first introduced by Heckler & Koch in 1967 making it the first pistol produced by the company. In 1971, Harrington and Richardson of Worcester, Massachusetts imported the HK 4 with special markings, in part to commemorate the 100th anniversary of the company. The HK 4 was designated "4" because the pistol had the ability to be modular in four calibers (380ACP, 32ACP, 25ACP and 22LR)Production ceased in 1984. http://en.wikipedia.org/wiki/Heckler_&_Koch_HK4
Image released into the Public domain for any any all uses.
Image is released into the Public Domain for any and all uses.