Thanks everyone for the helpful comments.

The owner tells me that the hands are original. In fact, apart from the bezel, the watch is exactly how he bought it new.

So it sounds like a Second-execution screwback case, which needs the thinner Minute bezel (agree that it would be unlikely to use a tachy scale).

Hopefully the owner can find a new bezel and then we'll have a "new" Autavia to add to the Autavia page.

David