50
It's not quite easy getting a photo while not only wearing it, but also showing the front plus a bit of the backside of the watchband at the same time. It's a snap-on design, where I spent like a week shaping and sizing the leather to my wrist, including water shrink shaping and sizing, before considering it properly finished.
A couple background links...
Good question ๐
For me, the size doesn't change significantly enough to make a difference, the margin of error is perfect for me.
The only real factor that might start bothering me every few days to a week or so might be a mild itch on my wrist, but that's easily cleaned with isopropyl rubbing alcohol.
I lined the inside of it with a section of bicycle inner tube..