I recently bought a Photomic FTn on eBay for my Nikon F (Serial#6809135), which was built in 1968. When I tried to mount it, the "claws" that wrap around the Nikon nameplate did not fit (see photo). Since 1968 was the year Nikon moved from the Photomic FT to the FTn, I was wondering if there could be any compatibility problems. In other words, I should have purchased an FT instead of the FTn. Any thoughts would be greatly appreciated. Thanks! Peter