I've just been given a good lead to more adverts, the Swiss 'E Perodicals' site.
Here are some more - from 1930:
From 1931:
From 1932:
From 1933:
One other interesting thing is that they also have the 'Swiss Official Gazette of Commerce' which has lots of trademarks and design registrations.
For example here is the registration of the special Helvetia logo in 1931 and they did start using it on adverts after this though I've seen it on dials from 1929.
And here is the first registration of the famous propeller logo from Jan 1933:
If this site isn't common knowledge let me know and I'll start a new thread with more info. It's invaluable for tracing the history of a brand.
Thanks.
Carl
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