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Eterna 833

Eterna Cal. 833 was one of a family of bumper automatic watch movements produced from 1941 to 1944.


ETA was one of the three firms “chosen” to develop advanced automatic watch movements by Ebauches SA, thanks in part to their history with Eterna. The chief designer at ETA, Heinrich Stamm, had created many of the company's important watch movements, and was famous for the Eterna-Matic line of watches.

Cal. 833 was an early bumper automatic movement. It was replaced by the direct seconds Cal. 1158 family. Cal. 833 was based on the hand winding Cal. 905.

Technical Details

This movement family includes 11.75 ligne, 12.25 ligne, and 13 ligne variants. Those with sub seconds are 5.4 mm thick, while those with sweep seconds are 5.55 mm thick. All have 17, 19, or 21 jewels, operate at 18,000 A/h, and have 38 hours of power reserve.


Cal. 833 one of a family of similar movements.

  • Eterna 833 - 11.75 ligne, central seconds, 5.55 mm
  • Eterna 834 - 12.25 ligne, sub seconds, 5.4 mm
  • Eterna 1076 - 13 ligne, sub seconds, 5.4 mm
    • Eterna 1077 - central seconds, 5.55 mm

See Also

eterna_833.txt · Last modified: 03.07.2022 15:33 by

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