There are rare watches even though at first they don't seem like it. This Constellation by Omega from the 70's has a gold 14k Case. The watch works well and last service dates from 2016 at Swatch Group. 
 
Details:
 
Brand: Omega
Model: Constellation
Reference: 168.015
Year: 1970's
Material: 14k Gold 
Dimensions:  35mm
Crystal:  Plexiglass Glass
Movement: Automatic
Bracelet/Strap: Original Omega Leather Band
Box/Papers: No/No