A few recent generations ago, a 34mm would have been a bit on the large size for a man. Certainly, at the very least, not small. Over the past 25 years I've had a variety of modern Omegas and Heuer re-issues and loved them all. I really never considered anything in the 34mm range and vintage watches (up through the early 80s) really don't appeal to me. Once I started looking at Rolex watches I noticed that the 34mm range had more appeal to me than other brand's 34mm offering. I would have thought the 34mm to be too small for me. However, a few additional parameters began to reveal themselves. At 6'-3" and a slim build carrying 200lbs, I realized that the (Ploprof inspired) Seamaster 1200m was not too much for my frame. So, I wondered how that played out at the other end of the spectrum with a decidedly much smaller watch in the form of a 2015 Air King with an Explorer style 3-6-9 polar face. My smallish wrist enabled me to easily wear it, but it didn't look feminine. I do believe the white dial lends to the perception of a larger watch. Visually, my polar Air King seems to be quite similar in size to my black dial Datejust, except when you have them one right beside the other, and even then... So, another few qualities to use in evaluating how a watch may look on you is your overall build and the color of the dial. There was a color insight above to a degree, but to my eye, a black dial looks smaller than a white one and that has factored into which watches I pursue in a given case size and dial color. At one end of the spectrum In my collection is my 34mm Rolex Air King and a 44mm Rolex SDDS at the other end. Both look right on me, I believe, but I can see where a different frame type may not yield the same results. YMMV.