RARE EARLY COLLECTORS’ ITEM NIKON F WITH PHOTOMIC NO II FINDER. The “Red Dot” version numbered 6595493. All Nikon F cameras of the 66xxxxx number block (and some of the 65xxxxx block)have a red dot in front of the camera of the serial number. This engraved dot indicates a production enhancement of the viewfinder allowing the mounting of the Photomic T and Tn (and the later FTn with modification of the name plate) finders. Our research suggests that there were just 2800 “Red Dot” 66xxxxx serial numbered Nikon F camera manufactured.