Movement: ETA 2842
Beat: 21,600
Jewels: 21
Hacking: No
Marking on the movement: 2842 V8AH2
Marking on the rotor: Swatch Irony automatic TWENTY-ONE 21 JEWELS SWISS
Marking on the case: V8 612 STAINLESS STEEL
The movement is the cheapest in the ETA automatic movement line-up. It is unfinished. Some people say it is built exclusively for Swatch. As far as I know, both ETA and Swatch belongs to the Swatch Group.
The ETA 2842 movement can be adjusted for accuracy through the regulator. However, it is not of the fine Etachron regulator found on more expensive movement. Nevertheless, people have reported being able to adjust the movement to within +/-10 seconds per day. The standard for chronometer is +/-6 seconds per day.
Service is recommended every 3-5 years. The service will involve cleaning and oiling. Estimation of the cost will be about half the price of the watch. The movement is expected to last if serviced.
Here is a detailed article about the finishing and performance of ETA 2842 in a Swatch skeleton watch. This is a 23 jewels version though.
[link]
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