Thanks to @ConElPueblo who pointed this one out. It was advertised as a certina skin diver from 1968 while it was a 37mm 1st gen kontiki from 1958. I'm planning to restore it but I will start a separate thread for some advise. But it sure will go nice together with my 1968 kontiki.馃榿
This arrived yesterday. It is a bit of a beast but I like it: the dial changes from grey to black depending on incident light. Made in 2006 but very few signs of wear.