Pentax Spotmatic SP500 mechanical manual SLR camera that takes Pentax M42 screw fitting lenses, the camera does have a fault, the mirror locks up when it is used on the 1 second, 1/2th, 1/4th and 1/8th of a second speeds on the faster speeds the mirror is fine, all of the speeds appear accurate, I have not checked the light meter as I do not have a battery to fit the camera. 

Ref Pentax Film Cameras (2)