Zodiac SST 36000 Wrist Watch
The SST day-date movement was a Zodiac Cal. 86, which has a high-beat escapement (36,000 beats/hour), and is based on the A. Schild caliber 1687. Zodiac, Girard-Perregaux, Eberhard, Doxa, and Favre-Leuba went in together to create an autowinder for this series of movements, in the early 60’s. Ebel also used that movement, and presumably others as well. The autowinder is what makes this watch run when you move it.
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