ETA 9121 – interchangeable spare parts

ETA 9121 movement

Which spare parts fit the ETA 9121 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

24Parts with interchange data
9Calibers sharing parts
Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of ETA and the original spare-part labels. All information has been carefully checked but is provided without guarantee. Please verify the interchangeability yourself before fitting, especially the height, diameter and execution of the part.

🔧 Interchangeable parts

Part no.DescriptionAlso fits
110ISO 10.048Train wheel bridge, jewelled
121/6ISO 10.058.23Balance cock for flat hairspring
227ISO 30.027Second wheel
Height 1305
Height 1585
242ISO 31.083Cannon pinion with driving wheel
Height 1195
255/1ISO 31.046.06Hour wheel, assembled
260ISO 31.041Minute wheel
277ISO 30.084Driving pinion for fourth wheel
303/1ISO 40.302
305ISO 60.150
316ISO 70.800.18Upper cap jewel with special end-piece, for balance
358ISO 40.380Regular corrector
405/3ISO 51.020Handsetting stem
471/4ISO 60.103Friction spring for sweep second wheel
495/2ISO 81.171Gib
4000ISO 10.513Electronic module
4000/1ISO 10.514Electronic module, assembled with coil
4360ISO 30.510Click wheel, pivoted
4401ISO 20.761Bridle +
4450ISO 14.600
7291ISO 34.058
7320/1ISO 34.060.06
7325ISO 34.050
7345/1ISO 54.081.06
7346ISO 64.111

Source: original interchangeability lists of ETA (checked transcription) and checked original spare-part labels · as of 2026-10-18. Height / execution: the part fits only in this height or execution.

🔗 Movements sharing the most parts

→ All calibers of ETA

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