50's vintage watch mens Dreffa geneve chronograph manual wind landeron 51 black

From 50s this swiis made rare Dreffa geneve chronographe manual wind movement, working well... 

Case:
o   Gold plated with back in stainless steel with marks and scratches all over
o    Fine condition with strong geometry
o    37mm without crown / 47mm lug to lug  / 12mm tickness /  18mm lug width
o    New generic plexiglass 

Movement:
o    Mechanical manual wind Landeron 51 -  working well, all functions ok.

Dial & Hands:
    o Untouched black and golden

Bracelet Material: 
  o New 18mm black  leather with generic golden buckle
 
Conclusion / Condition: 
a rare and sporty piece from a fantastic decade of Swiss watchmaking

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...