This is the Nikon F-mount body cap "BF-1B"! I found this while organizing my camera equipment. I bought it as a spare and never used it, so I'm offering it for sale in case anyone wants it! Here's a product overview: This cap protects the lens mount of your camera body from dust and debris when storing or carrying your Nikon SLR camera with the lens removed. Made of plastic, it's compatible with Nikon digital SLR cameras and 35mm film SLR cameras. The F-mount, adopted since the Nikon F released in 1959, has been used for many years on Nikon digital SLR cameras. It's in like-new condition with no noticeable stains, but please check the photos for the condition. *I want to sell this quickly, so if you purchase this along with any of my other listings, I'll offer a combined discount. Feel free to ask! #Fmount #bodycap #BF1B #Nikon #camera #SLR #cap #cameracap #lid #lensprotection