This is a Nikon genuine lens hood, F-marked type. It is the lens hood later designated as HS-4. ◆Compatible Lenses◆ Medium telephoto lenses from the Nikon F era: ・NIKKOR Auto 10.5cm F2.5 (NIKKOR Auto 105mm F2.5) ・NIKKOR Auto 13.5cm F3.5 (NIKKOR Auto 135mm F3.5) This is a metal lens hood for these lenses. The specifications are indicated in "cm (centimeter)" and have a lowercase "F" marking. It is a snap-on type that hooks onto the lens's filter thread, so if the filter diameter is 52mm, it can also be attached to other telephoto lenses. There are scratches; please check the photos. Please refrain from purchasing if you are sensitive to used items.