That is not really the Carlos Coste, the Coste is a lefty (chrono buttons on the left side of watch)What you see there is a combination (bastardization) of the Carlos Coste and Pro Diver with a Quartz movement, I have one and like it but it does sit like a hockey puck on one's wrist and needs some gluing when you get it (there is a plastic ring on the bezel, mine popped off the minute I turned the bezel, glued it on and no more problem
The Carlos Coste with the 7750 is notorious for stripping the crown, it is a 47mm watch where the Pro Diver is 51mm, Coste also has a day date window at 9 oclock the Pro diver has the date at 6 oclock (at the bottom of the subdial )
I have a 21j Carlos Coste and am quite pleased with it...dont need the chrono function which is a mess due to the lefty and day date window arrangement