Early Eterna automatic movement patent

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Early Eterna automatic movement patent

Postby MKTheVintageBloke » August 20th 2017, 8:02pm

So I was just doing some search for Eterna stuff on Espacenet (trying to look up case design patents, but it appears that in the period I was researching, they didn't register one), and I came across this:
https://worldwide.espacenet.com/publicationDetails/biblio?II=24&ND=3&adjacent=true&locale=en_EP&FT=D&date=19310131&CC=CH&NR=144905A&KC=A

It appears that in January 1931 (same year as Rolex's patent for the Perpetual rotor) Eterna was granted a patent for an automatic winding watch... Which not only puts it among the pioneers in developing automatic movements, but also makes me wonder how this movement could have looked like. I haven't seen an automatic Eterna movement earlier than their 1939 mass-made bumper automatic, the cal. 835H:
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Eterna_835H
...and trying to look up anything more about the patent didn't really yield any results.

Interestingly enough, it appears that they have been granted another patent only a year later, for another automatic watch, in October 1932:
https://worldwide.espacenet.com/publicationDetails/biblio?II=47&ND=3&adjacent=true&locale=en_EP&FT=D&date=19321031&CC=CH&NR=157997A&KC=A

Has anyone ever seen any actual example of an automatic Eterna dating to roughly when they have applied for the patents?
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