Patek Philippe Calatrava watches are indeniably the watches that are the most often in great condition. This 3537 was passed on almost 4 decades ago and was not worn since, hence its amazing condition. The watch works great and comes on a short 1940's English band. 
*** The pictures may show the reflection of the camera lens, black spots mostly ***Details:
 
Make: Patek Philippe
Model: Calatrava
Reference: 3537
Year: Circa 1967
Material: 18k Gold
Dimensions: 33mm
Crystal: Plexi Glass
Movement: 23-300
Bracelet/Strap: Leather Band
Box/Papers: No/No