Fujica ST901

I think that Fuji was one of the last Japanese builders to use the M42 screw mount while the others had moved to bayonet.
This one is an automatic aperture priority, the light metering is made open diaphragm, but only with Fuji lenses that have a proprietary coupling (different from that of Pentax). The shutter speed is indicated in the viewfinder by means of a LED display (hence the LED logo on the front panel). The shutter uses a horizontally scrolling textile curtain, 20s to 1/1000s in automatic. It can be used in manual (no lightmeter), the speeds available in this case are between 1/60s and 1/1000s (+ B), flash sync 1/60s. Power supply: one PX28 battery.
Fuji is one of the pioneers of multicoating, electronically bombarded processing, hence the abbreviation EBC (Electron Beam Coated) on the lens.
This camera works perfectly, but the the lens and its diaphragm came stuck, as if a poor quality lubricant had been used, which rot over time. I cleaned and regreased, but the diaphragm remains lazy.