The last version of the 53mm f2 is all black, made for the black Beseler Auto 100.

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And for reference, here are the other two silver and black versions of the UV Topcor 53mm lenses. The one on the right is the intermediary model, with a slit instead of a j slot, and the left has the late "solid" tabs. The lens release button is also different. Optical design appears to be the same for all 3 versions of the lens.

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With the lens removed from the Wink S Mirror camera, the mount on the lens side reveals the earliest type of lens mount, with the retaining tabs having a J slot, possibly to apply some pressure on the opening tabs on the camera mount side. I've only seen this J slot on the 53mm, but I suppose an early 35mm or 100mm lens from 1963 would have the same.

Uses a seikosha leaf shutter like the Uni.

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