[blumoon722]

Can anyone tell me what this is?

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[ramseybuckeye]

Could it be part of an optometry vision testing setup?

[Bob 256]

It looks like a positive lens designed to swing into an optical path for some use. I''ve seen something like this on glasses for jewelers where the glasses are for regular use and then when the jeweler wants to examine a watch close-up, they swing the lens down in front of one eye or the other (usually the right eye), and voila, instant magnifier.

Something like this:

https://www.etsy.com/listing/805519281/flip-up-flip-down-steampunk-jewelers?...068e2599beb45c

Maybe????

[ismaelg]

Hello,

Is the pin fixed? Could that be related to the Exakta mount? Looks like a front element of a lens. It seems it screws into something else.

Thanks,
Ismael

[Fogel70]

Could it be part of an optometry vision testing setup?

That would be my guess also. Something old like these.
31 Antique Eye Equipment ideas | vintage medical, optometry, antiques

[Not a Number]

Reminds me of the condenser lenses under a microscope stage.