This is a rare early Hasselblad lens cap that fits the Kodak Ektar 135mm f3.5 chrome lens that was produced for the 1000F and 1600F cameras. Some minor signs of use and age, Please see all photos.  Black flocking inside, perhaps some missing around inner edge.  Early version of "Flying V" logo is embossed into the metal.  Inside diameter appears to 58 or 59mm. Free shipping in US.  International by Ebay Global Shipping.