Anyone ever see one of these before?

No date on anything, I can only find one sold listing on eBay, but I’m guessing from the 50s. The slide viewers are really nice Bakelite feeling, and the camera adapter/prism is in a lovely metal housing.

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The best part - the thread on the prism adapter happens to match the thread of the filter ring on my Minolta

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I took a couple test shots to see if they actually turn out and work as stereo slides. Should be fun.