@welshlad
Thanks for the measurements. They were interesting. I measured a few of my watches to compare.
My Speedmaster measures only 34.1mm to the outside of the box crystal, and the dial itself is maybe only 31mm, although the dial extremities may be concealed by the crystal. I think it wears very daintily despite the notional 42mm case size. I measure the bezel at 39.7mm.
My C65 Handwinds are similar, although I think the dial extends slightly more under the crystal than the speedmaster dial does. I always thought the C65 bears quite a resemblance to the speedmaster, the black in particular, although the hands and indices aren't white.
My Omega Geneve which I have always considered to wear very nicely, despite being quite small has a case size of only 35mm. but the dial is about 31.6mm, which is larger than all of the watches you mentioned.
One watch I do have that always seems small is a Versace DV25. It's 40.8mm wide, but the flat crystal is only about 27.8mm, and that seems to be a couple of mm smaller than anything else I have, and bears out what you say. I wear it less than I thought I would.
The Berny railway watch I am wearing today has a case of 39.8, but the dial is a very legible 34.8mm.
On this basis, I would be reluctant to buy anything with a dial much under 32mm. Even my mighty Oris Aquis, nominally 43.5mm has a dial of only 32.6mm. similar to my C60 Bronze Ombre.