From what I have read, my Air King at 32mm was regarded as unusually large when it was originally made in the 40s. It was designed to be oversized for pilots. Times have very much changed.
They were designed to be worn on the outside of the pilots (or navigators in the base of the beobachtungsuhr) flight jacket and oversized for legibility
Hmm - interesting, as the original flieger's were a massive 55mm: http://forums.watchuseek.com/f438/beobachtungsuhr-brief-explanation-650434.html
They were designed to be worn on the outside of the pilots (or navigators in the base of the beobachtungsuhr) flight jacket and oversized for legibility