Breguet Chronograph Ref 5247 Rose Gold.
There is not only the Type XX which is dign of interest when it comes to Breguet Chronographs. There are others, such as a Rattrapante, or... This non Rattrapante version, the 5247.
The case has reasonable dimensions, 40 mm, in rose gold, like the one pictured or, my favorite, in white gold.
Here it is ( Credit picture: Christies )
Did I say the dial is enamel?
As for the movement, it is a manual winding one, nicely finished... Cal 2320.
I will try to find a solution to take my own pictures of this watch. But at least we have those, in the meantime...