My Seiko 5 is 37mm. It's the only watch I own under 41mm. I love it, and would have no problem wearing a smaller watch like your MUT. All this discussion about small versus large watches is very interesting. I don't feel invested in a preference for either smaller than average or larger than average timepieces (What exactly constitutes a "smaller than average" watch -- is it one that's less than 40mm?).
Anyhow, it's an interesting discussion.
Cheers,
Daos
