I have a modest Orient Mako which I love and get a ton of use out of. I have a skinny 6.5 inch wrist and I like the way it fits on me. The diameter of the watch is 41.5mm. A lot of forum favorite dive watches ( Tudor Black Bay, Chr Ward C60, Steinharts etc ) measure 42mm, so one might think, "hmmm, if 41.5mm fits me well, then 42mm should too. 0.5mm is tiny right?" I noticed, however, that these watches look rather large in a lot of on-wrist photos. Lug to lug, the Mako measures 46.5mm while these other watches measure around 50mm. That's a big difference. And in looking at my collection I see that 47mm is about the max I can get away with.
You see many really nice 42mm watches out there and it is tempting to think that that size is for everyone, but if you have a wrist on the small side, check the lug to lug measurement. The case diameter is almost always given in the specs but the lug to lug length usually takes more digging but I think it tells you a bit more about how the watch is going to fit.
Any thoughts on this?