One of the most difficult theme to fulfill is the military watch collections as it involves many countries and types. My third attempts in collecting military watches seemed to be able to gain traction.
a. The Czech Pilot wastches (need to find Etena)
b. Pilot Chronos
c. Benrus Type 1, Type 2 AB
d. IWC Mark X, XI
e. The Dirty Dozen (7 more to go)