The Petri 7s was introduced by Petri in 1963 as a variant of the Petri 7 which was introduced in 1961. The main difference being an improved film advance lever and frame counter. It took 35mm film, had a coupled rangefinder, and an around-the-lens selenium cell light meter. Production ended in 1973.
Compared to its predecessor, the 7s is very advanced. It has ATL (around the lens) selenium metering with a match-needle visible both in the viewfinder as well as the top of the camera.
The 7s was available with either a 45mm f1.8 or f2.8 lens. The shutter had speeds up to 1/500, and the viewfinder used Petri's Green-o-Matic system.
Selftimer is not working in this particular copy.