Dear Jasper, thanks a lot for sharing these pictures of a watch so very rare!
It's the second time I see it in pictures, and indeed the very first I see the bracelet.
This must be a gorgeous watch (and very heavy as well in solid gold!) but still as ultimate dress watch I'd still stick to the manual wind silver-dial Carrera. This one looks a bit too bulky to me, like the 1158CH.

Agree with Mark that's a pity they didn't put the 'Carrera' moniker on the dial of this one: especially so if we think it's a Carrera case (of course you were right Mark, I haven't forgotten ;-)) and the Carrera-like tachy bezel, as it starts at 500 like the 510.511 and 510.523 and not at 350 like the 510.50x.
Cheers,
Fabrizio