Nice find! Thats a Autavia 2446c MK I. I would say 6-8k for the watch itself and another minimum 3k for the rare and sought after double grain BOR! Prices of Heuer watches flatten in the last year, but are still valuable.
Movement is a Valjoux 72. It’s a snap back, so should be easy to open and show if the movement has the correct markings (which I bet).
Nico
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