| Manufacturer | Jaeger-LeCoultre (JLC) |
| Calibre Number | 657 |
| Type | Quartz |
| Jewels | 4 |
| Frequency | 32,768Hz |
| Battery Cell | SR616SW |
| Hands Count | 2 |
| Functions | Central hours; central minutes |
| Country of Manufacture | Switzerland, Swiss made |
| Known Models | Reverso Classic Small 261.81.30, Reverso One Reedition 325.84.70, Reverso One Cordonnet 326.44.20 (Add your watch to the comments below…) |
The Jaeger-LeCoultre caliber 657 is a Swiss made in-house quartz movement found in smaller ladies sized Reverso timepieces. Such model have made use of this caliber since at least 2016 (source).
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