Lépine
1318
A little IJN history
Lots of people ask me how and why did the Japanese have Weems watches. No one seems to know the Japanese created an Aviation program almost at the sametime as the Americans and the British. Starting I believe before 1920. The Japanese Navy was modeled aft the Royal Navy. Many early ships were bought from the British. Japan also bought many British aircraft and had a British delegation visit Japan to teach the Imperial Navy fighter plane tactics. Japan then corresponded with USN for how to train fighter pilots, do celestial navigation, and bought Longines from the US. The Smithsonian museum has a collection of PVH Weems documents they have not scanned. The on-line indexes indicates that close to 1940 all of a sudden PVH Weem was restricted from further knowledge transfer to Japan. By that time, Japan had the Edwin Link flight simulators, USA Army bubble sextant used for Weems navigation, Weems navigation calculators, and of course the Weems watches. Japan had a bigger navy than the USA and more aircraft and trained pilots with 4 years of active combat experience before Dec 7th 1941. USA had no combat experience for their air force of that time. See Sino-Japanese War 1937. 
What do you think of these watches?
I know him. But I cannot remember if it is his, or another one I spotted in a shop in Paris... You might well be right, as I took these photos the same day I took another Weems in photo, too
Reconnaissance pilot in full gear. Reconnaissance Equipement.
I believe Hiroyoshi Nishizawa had one.
This is 1 year research results. Only 19 IJN exist today that we know of.
There are two references I believe off my memory. One is for the Mark 11 Longines. Most everyone only knows about the Mark 11 IWC and Mark 11 JLC. For thr RAF Vulcan Bomber, there was also a Mark 11 Longines
Both at 6111 but case engraved differently
A little IJN history
Link to concise notes on IJN development of aviation and research into IJN Weems.