Hamilton Intramatic Auto or Manual?

Quick comparison of these two Hamilton Intramatics.

H38416711
Caliber H-31 Auto

H38429710
Caliber H-51 Manual

40mm case
49mm lug to lug
14.6mm thick
20mm lug width

To see how they wear on a 6.75” wrist:

https://www.instagram.com/p/CNNUw0djQZu/?igshid=1xvlggzo8p5rf

Видео Hamilton Intramatic Auto or Manual? канала Brent Miller Time