I thought that I would post a link to this nicely written piece on a Zenith Sporto cal 126-6 that a bought from an OF member last year, as you guys may be interested!

I felt the mainspring snap as I wound it for the first time...damn, but all good as Rich has it sorted and it features on his blog:

https://thewatchspotblog.com/zenith-sporto-zenith-cal-126-6/