Wearing my Seiko Astron today, I began to wonder about caseback shapes.
How many are concave:
Curved to confirm with the arm’s circumference. 
Versus those that are convex, or protruding into the space between your arm’s bones (or into your arm itself). 
As in the Bell & Ross Space4?
Can anyone nominate a comfortable hero, or a hard-to-wear villain?
Of course watches with transparent caseback are generally flat on the back, but perhaps not in every case(back). Ha ha.
Cheers,
Cazalea


