I think with the Aquitaine, it's difficult to do and keep the 5-60 scale legible. It would have to be a bigger scale like the chapter ring on the Dune because it's top hat crystal would probably completely distort any small text there. For the Dune, there's simply not enough space between the indices and the GMT chapter ring. Would make the dial too cluttered.

I might get shot down here as I’m guessing but for me the Aquitaine and Trident are both divers and the rotating bezel is for diving / oxygen left and nothing to do with the GMT movement per se.

Edit: ment to say you wouldn’t need the GMT whilst diving so bezel is multitasking in these watches for different scenarios.

It is easy enough to remember where the cardinal numbers are on the dial (24, 6, 12, 18). I don't have any trouble at all tracking three zones without an inner 24 hour ring. I set my C65 GMT to UTC using the dial and then rotate the bezel for a third zone.

The Dune is a different style GMT so the inner bezel works there I think. I think the driver for this design is to have a more svelte field style watch with a GMT function.

To me a fixed inner timing ring isn't all that useful.


@foxes1884 The timing bezel on a diver was never used for monitoring oxygen. It was for tracking bottom time for no decompression or bottom time and then subsequent decompression stops. Oxygen was always monitored with a pressure gauge. Now it is all in the computer with backup gauges on the tank.