
The ETA 2403 watch movement, produced from 1965 to 1972, shares similarities with the 784 and 3305 movements, although the specific differences between these models are not known. It features a manual wind mechanism, a sweep second function, and includes a date feature which can be set by adjusting the time indication between 21:20 and 24:00 hours.
The ETA 2403 features the following functions:
| Ronda Reference # | Shock System | Buy |
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| Dimensions | GR Reference # | End Type | Buy |
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| 1.30 x 0.080 x 245 x 7.5 mm | Manual | Buy mainspring |
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
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| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
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| Part Description | Reference # | Alternate | Buy |
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