40s vintage watch Certina art deco square KF 300 serviced

Case:
o   Gold plated and back in stainless steel, ref. 683 4 serial 787509
o   Fine condition with strong geometry, fixed and fancy  lugs
o   27.5mm without crown / 39.5mm lug to lug  / 10.5mm tickness /  16mm lug width
o   Original crystal with shapes

Movement:
o   Mechanical manual wind cal KF 300 - serviced by watchmaker on October 2025
(movement was disassembled, washed, lubricated) 
 
Dial & Hands:
o Untouched with evident signs of age

Bracelet Material: 
  o New dark brown leather open ending 16mm with golden generic buckle
 
Conclusion / Condition: 
A very nice vintage certina, hard to find…

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...
Keep in mind that it is a vintage watch, it is normal to be 1/2 minute early or late
wrist-treasure