In 1957, Charles-Eugen Blum of Ebel wrote a letter, joining with other watch company heads to create a new high-precision consortium, called "Communaute d'horlogerie de precision" (CHP).
The above letters are presented on Ebel's website, but are too small to read. The letter on the left is Blum's promotion of the concept, and the one on the right appears to be a draft of an article about the group.
What pointed me in this direction was a statement in the service manual for Zodiac high-beat movements (of the late 60's and 70's) boasting of Zodiac's membership in this group.
So, I started digging, and found the article (that may be what is shown in draft form above) in the June 11, 1958 issue of L'Impartial, the local newspaper in La Chaux-de-Fonds.
Here's a translation:
'Nine Watchmakers Founded a "Community of Precision Watchmaking"
Considering that the evolution of the watch-making makes desirable for closer collaboration between manufacturers of precision watches, watchmaking factories here after listed,
Ernest Borel & Co. S.A., Neuchatel
Doxa S.A., Le Locle
Ebel S.A., La Chaux-de-Fonds
Eberhard & Co., La Chaux-de-Fonds
Favre-Leuba S.A., Geneva
Girard-Perregaux & Co. S.A., La Chaux-de-Fonds
Heuer & Co., Bienne
Juvenia, La Chaux-de-Fonds
Zodiac, S.A., Le Locle,
have formed a company under the name of "precision watchmaking community."
This company, while respecting the individuality and independence of its members, aims to promote and foster their activity and development.'
This was the organization behind the development of the autowinder for the A. Schild 1687/1688, which became the Ebel 213 and 214, the GP 32 series, the FL 1152, and Zodiac calibers 70 through 88. This was also the consortium that took the work done by GP to turn a 1687 into a high-beat movement (which they did in 1966) to the other members of the consortium in 1968. This was the basis for the Zodiac SST line and many other high-beat implementations.
It's an example how how the Swiss industry worked cooperatively while still being competitive with each other. Many of the owners of these companies were probably regulars at Charles Blum's legendary weekly card game in La Chaux-de-Fonds, and I wonder if this idea was hatched there or at some similar informal gathering.
Rick "a little more Ebelian history that really is history of the whole industry" Denney