Vintage 1960s Zeiss B50 Magnification Close Up Filters Made in West Germany x4

Vintage 1960s Zeiss B50 Magnification Close Up Filters Made in West Germany. These filters were to achieve telephoto and macro results with Zeiss lenses from the Cold War era. I know they can accommodate the Icarex line: Skoparex 35mm, Ultron and Tessar 50mm, Dynarex 90mm, Dynarex 135, and Dynarex 200 but I think they probably works on some of the Rollei Versions and potentially Hasselblad too. I think the B50 bayonet mount was pretty ubiquitous in west Germany in the 1960s. I only used one of these filters for one shoot. They are in mint condition and even come with the original Zeiss cases. A collectors item or can be used by photographers with vintage German lenses.