A curious "Rotary'" Speedmaster companion?

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Picked up this oddity today.

A Rotary GT, manual wind. I cannot find another like it on the web. But, those hands! They are either very close to or are Speedy hands?

Haven't had a chance to pop it open and see the movement, but I would take a bet that the dial is from Singer.

Just a curio but one that shows how much sharing there was in the 60s!

 
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Even has the not so subtle checkered flags and GT!
Yeah they did loads of different versions but nearly all autos. They also did a cool Monza one in a skin diver case.