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That’s in stunning condition, congrats!
I think this qualifies. Chatham Instrument Co. with the Zenith 12-4-P-50-6 inside (12-4-P with sweep second and incabloc)
If you look them up, everyone associates it with Universal Geneve for some reason. Nobody ever decided to look up the movement I guess.
Not the best condition, but unique (and available if anyone is interested)