Certina DS 'turtle' - Automatic

Here is a watch from my collection.

This one is a Certina DS from the late 1970s.  The dial has a great patina and I am trying to decide if I should polish the case or not.
Probably not. It seems disrespectful.  Most of these require some tinkering and oil.  It is pretty rewarding to get something this complicated moving again.  This one keeps excellent time.

To see more of my collection, click here:  watches