Bizarre musical instrument trainer

Saw this in a thrift shop, any ideas as to the purpose?

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Designed with chromatic scale in mind. I am going to look this up.

That could mean two things (to me); either it’s chromatic intonation vs euqal-tempered (but then it has to be set for a specific note/scale), or it’s steps are half semitone (I think… or maybe a smaller subdivision?), which would be very cool.

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You play it backwards to summon the dark lord.

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