Not a big fan of Roger Dubuis. As case sizes is something significant for you, why not the following:
By: Alkiro1 : February 4th, 2018-03:51
- Vacheron Constantin Les Historiques chrono 47101 - Blancpain Villeret 6185 (you have a model in white gold and copper dial which is truly gorgeous) - Ulysse Nardin monopusher 386-22?
I'm sorry to say it but it's not going to be easy.
By: VMM : February 4th, 2018-04:31
The 1815 is 39,5 mm, smaller than that for a modern high end chrono is quite unlikely to find. Maybe you should try to find a nice vintage chrono, they used to be smaller back in the days. Right now the one that comes to my mind, a favorite of mine, it's the Ulysse Nardin Monopusher 175 Anniversary in WG, what an amazing watch. If you see it live you'd fall in love. The problem is that you can't buy it new and it's not easy to find a nice one in the second hand market. Another nice option would be the new Royal Oak in 37 mm without diamonds on the bezel, now they have a grey and a blue dial available. I'm sure it will look great on your wrist. Good luck! Vte
... but that shouldn't stop you if you love it. I have quite a few watches that look ridiculously large on my wrist. It doesn't bother me. I bet you can find a really nice, high-end, vintage sub-37mm chrono -- especially if you're okay with yellow gold (which I love).