40's vintage watch Cortebert WW2 ref. 8510 manual wind ET. 926 military style

From 40's world war two era this rare Cortebert (small size), made and exported to the American market, working well...

Case:
o    All in Stainless steel ref. 8510 and serial inside 318076
o    Fine condition with strong geometry
o    31mm without crown / 36.5mm lug to lug  / 10mm tickness /  16mm lug width
o  New generic crown
 
 
Movement:
o    Mechanical manual wind Cortebert ET: 926 -  working well

 
Dial:
 o   Untouched amazing two-tone dial with a combination of colors reminiscent of "The roundel" on military planes (The symbol painted on old warplanes that looks like a target is actually called a roundel), numbers in Arabic style.

Bracelet Material: 
  o   New nato black 16mm
 
Condition: 
watch with evident time marks with all its history but in good working condition, rare piece...

please see photos as they are part of the description.
No box or pappers, no water proof test, sold as is, any question feel free for ask...