I recently found a watch that had belonged to my father-in-law. I know it's from the 70s as it can be seen on his wedding photo, and my mother-in-law remembers buying it for him before the wedding.
Unfortunately, not much more is known... so I'm turning to you in hope of finding some answers.
I've attached some pictures, but am currently reluctant to open up the watch to take photos of the movement.
Front only has the logo of a crown and 25 jewels Automatic. Weekday displayed in German (DONnerstag)
Back cover shows AUTOMATIC and ETANCHE CONTROLEE. The back cover also has four small indentations or holes, which I figure is to open it. I however do not have a tool which would be able to do so.
Strap is branded with "Expandro", followed by "Stainless Steel", "Made in W-Germany", "Pat.Pend."
Thanks and kind regards,