This sale is for a really mint condition and probably unused genuine No. 1 80mm Lens Hood for use with any RB67 or RZ67 50mm or 65mm lens, or also with the original version Mamiya 645 45mm f2.8 C lens.
This hood collapses for storage on or off the lens. It has no signs of use. Many photographers (including me) also use this hood with the Mamiya 645 35mm f3.5 C and N lenses as Mamiya did not produce a specific hood for these lenses.