Nikon F engraved with “Nippon Kogaku”. Photomic prism (1st model) N ° 921425. Light capture through the round window on the prism (not TTL) with the light blocking plate. We can see the 2 accessories: the tube - for the photographs made with a telephoto lens - stored on the left and to be screwed on the light input and the opaline disc for the incident light already screwed in place.