What a great little watch that is tribe and a lovely bit of history too. It's packed with all the best names in the business, Tavannes - Cyma made some great innovative movements in their time and that looks super, great balance wheel and escapement, so it should be an accurate movement. ALD made high quality cases and at one time in the early days even made them for Wilsdorf Davis who later became Rolex and of course Benson only really dealt in nice quality pieces, even when they were just retailing.
I'd definitely get that one serviced and back in full working order, it shouldn't be at all difficult and the movement numbers etc should, with a bit of research, yield a lot more info for you.
A great little watch and could give you a lot of years yet if you look after it. :-!
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