I think all bar two or three of my watches are between 40mm and 42mm. I find it hard to wear anything smaller (apart from my Omega Megaquartzes which are an odd shape) or larger. I'm starting to think that as most people wear their watch on their left wrist anything over 40mm should have the crown on the left hand side, you head over 42mm and some watches are just too uncomfortable with the crown on the right. The automatic Autavias are so comfortable partly because of the crown location.