I didn't pop open the back today, but took a few shots of the Swiss Repco I picked up a couple weeks ago. It needs a nice strap, but open-end straps are not plentiful.
This example was made in Tramelan, Switzerland about 50-60 years ago. The case is solid 18K rose gold and the 17 jewel movement (not shown) has Geneva stripes across the plates.
I hope to get it in my light tent maybe next week sometime.