50's vintage watch mens Certina certidate automatic cal. 28-45 patents+ gold pl

From 1959 this Certina certidate automatic cal. 28-45

Case:
o   Gold plated with back cover in stainless steel with marks/wear and scratches all over,  ref. 28503.4 serial 3522171
o    Fine condition with strong geometry
o   34mm without crown / 41mm lug to lug  / 11mm tickness /  18mm lug width
o   Original plexiglass with scratches, most salient mark between 12:00 and 1:00
o   Original certina crown 

Movement:
o    Mechanical automatic certina 28-45 21jewels patents+ - working well
 
 
Dial & Hands:
    o Untouched in good condition

Bracelet Material: 
  o New 18mm croco light brown leather with generic golden buckle
 
Conclusion / Condition: 
A great vintage piece with quality of certina in great 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...