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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Setting the ISO (ASA) on the Topcon IC-1 is also done on the lens mount, at the bottom. Ring also shows DIN values.

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Here is the detail on the camera side of the mount, with the lens on the side (hi topcor 55mm 1.8)M Topcon also sold an adapter for the RE Topcon mount, to accept UV lenses on Topcon RE cameras (such as those used by the US Navy).

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