Dat bezel insert screams Speedmaster to me...

 

Not this one again. Never seen a Heuer like that before. It looks to have some age to it, however. I suspect it's some sort of watchmaker's creation using a mixture of non-original parts. What does the movement look like?

 

It was supposedly given to British Yachting Team

 

It kinda looks too bad to be fake...

 

Is that a good thing?

 

That's a Valjoux 7733 movement - used in a lot of Swiss watches in the 70s, including Tissot. I still don't think this is an original Heuer. I think someone has created that dial and put it in another watch. I also believe that Heuer has been etched on the bridge by whoever created it, not by Heuer. I think it's very unlikely you're sitting on some undiscovered model and don't think this has a lot of value I'm afraid.

 

7736, 3-reg with 12hr counter. 7733 was a 2-reg 30min chrono.

This watch is unfortunately fake @Mike Langdon , every last bit. Sorry

 

Yes, sorry you are right. And 7734 had the date complication iirc.