The Olympus OM-2 is a semi-automatic mechanical SLR camera with interchangeable optics and built-in light meter. The available shutter speeds range from 1-1/1000th sec. It is a compact, lightweight (500 g.) camera with very successful damping of the release process (mirror capture and shutter noise).
The serial number of the camera is 906925
Tested with 2 x LR44 batteries. Shutter works and lightmeter reacts.