This is a vintage New Old Stock (NOS) Tiffen Adapter Ring, size 22.5-5. It is designed to adapt a 22.5mm lens thread to accept Series V (Series 5) filters and accessories. The item is in its original vintage box, featuring period-correct typography and handwritten notations. Made from high-quality black anodized aluminum, this ring is in unused condition—perfect for collectors or photographers using vintage 8mm movie cameras and compact classic lenses.