What is this pen-shaped optical device found in an old writing desk?

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What is this pen-shaped optical device found in an old writing desk?

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Lemmit.Online botMAB to identify unknown objectsEnglish · 2 years ago

This is an automated archive made by the Lemmit Bot.

The original was posted on /r/whatisthis by /u/Taurin_Fox on 2023-08-30 04:48:31.

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Welcome to r/whatisthis, a subreddit for identifying objects of unknown make, type, or origin. If you have something and you don’t know what it…

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