A Watchprosite Ulysse Nardin?
Let's start from this Torpilleur:
Let's take a 40 mm case. No need to go bigger, in my opinion. Steel or titanium, up to you... Steel would be less expensive.
Then, let's go for a black enamel dial.
Smooth step bezel.
Let's change the see through case back for a solid one.
And let's have a case which must be 100 meters water resistant, with a screw down crown.
What do you think?