Just though I'd let people know that I have finished a huge update after a lot of research to the page on my site on the history of the Société d’Horlogerie La Générale and Helvetia and you can find it here:

https://www.helvetiahistory.co.uk/history

One of the most surprising things I found is that the Montres Helvetia S.A. that is around at the moment is not a modern relaunch but isn't the Helvetia that grew from La Generale either. It is actually Montres Silvana S.A. that took over the Helvetia name in 1973 when they were both part of SGT and as such has been around since 1923.

Nice to see one of the old companies still exists even with a name change!

Thanks. Carl.