The Pentax K1000 (originally marked the Asahi Pentax K1000) is an interchangeable lens, 35 mm film, single-lens reflex (SLR) camera, manufactured by Asahi Optical Co., Ltd.from 1976 to 1997, originally in Japan.  The K1000's extraordinary longevity makes it a historically significant camera. The K1000's inexpensive simplicity was a great virtue and earned it unrivaled popularity as a basic but sturdy workhorse. The Pentax K1000 eventually sold over three million units.
lens no. 3753434