From 70's this Eterna military style, automatic bumper movement serviced by watchmaker... 

Case:
o   All in stainless steel with marks and scratches all over,  serial 3162542, inside stamped "brevet"
o  Fine condition with strong geometry
o  31.5mm without crown / 39.5mm lug to lug  / 10.5mm tickness /  16mm lug width
o  New generic plexiglass 
o  New generic crown

Movement:
o  Mechanical automtic bumper Eterna 835H serial 3182781-  serviced by watchmaker on January 2023
(movement was disassembled, washed, lubricated) - photo of timegrapher

 
Dial & Hands:
    o  Untouched tropical dial with black scale, FANTASTIC...  

Bracelet Material: 
  o  New 16mm black nato
 
Conclusion / Condition: 
An antique piece with history visible by the color of its dial in good working condition...

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...