Petri Micro Compact

This camera was designed when it was "in" to sell a competent camera in the smallest package possible. Size was always a factor in the attraction of film cameras, just as it is with digital today.  Every manufacturer had something to offer in this genre, maybe the most well known being the Rollei 35 series first introduced in the mid sixties. This Petri first appeared in 1979.
This one is derived from the more expensive, better made, and feature-rich Petri Color 35 which commands high prices and is tough to get (see Steven Gandy's article here) It has automatic exposure, a pull out lens, and a simple zone focusing system.
I confess I'm a sucker for these tiny cameras - I took the picture of the Petri with my digital Ricoh GRD IV, which surprisingly is just a bit larger.