The Fujica ST605 was a single lens reflex camera introduced by Fuji around 1976. It has an M42 screw mount and an odd top shutter speed of 1/700. The button next to the lens stops the camera down for metering and activates the built in light meter. It features both a hot shoe and a pc flash socket. Mine has a 55mm f2.2 Fujinon lens, and it came with a disintegrating leather case.
I loaded a roll of Portra 400 and took it to Salisbury Beach for lunch.
Manual for the delux ST605N from Mike Butkus' OrphanCameras.com