| Brand | Rolex |
| Caliber Number | 6620 |
| Movement Type | Quartz |
| Jewels | 8 |
| Crystal Oscillator Frequency | 32,768 Hz (cycles per second) |
| Duration of Impulse | 7.80 ms |
| Overall Diameter | 19.80mm |
| Battery (Cell) Number | SR 721 SW (1.55V) |
| Functions | Hours, minutes |
| Country of Manufacture | Switzerland |
| Known Models | 6623 |
Despite popular belief, Rolex also produces quartz movements, notably the caliber 6620 found in some Cellini models (ie: Rolex 6623). Some other characteristics are:
- Stop motor device
- Rotative stepping motor: 1 step every 10 seconds
- Acceleration device for checking the train: 32 steps/sec
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