|Petri MF-1 with Petri C.C. Auto 50mm f/1.7|
image by Kimmo Kulovesi (Image rights)
The MF-1 is a 35mm SLR from Petri released in 1977. There seems to be a identical model named MF-T 1000.
It uses a M42 mount for the lens. It features shutter speeds from 1s to 1/1000s with B and a self-timer. The flash sync at 1/60s. A removable hot shoe is mounted via the X-sync connector located on top of the prism area. This idea is similar to the Olympus OM SLR cameras. The meter is Cds based and powered by PX675 mercury battery.