| Manufacturer | Ulysse Nardin |
| Caliber Number | UN-22, UN22 |
| Base Caliber | ETA 2892-A2 |
| In-House | Base: No / Module: Yes |
| Measurements | 16 1/2”’ (36.60mm) |
| Vibrations Per Hour | 28,800 bph (4 Hz) |
| Power Reserve | 42 hours |
| Jewels | 23 |
| COSC | No |
| Hacking | Yes |
| Functions | Hours, minutes, central seconds, date (2:00), home time indicator (9:00) |
| Other Features | Forward and backward hour hand corrector |
| Country of Manufacture | Switzerland |
| Known Models | San Marco GMT |
This example of the Ulysse Nardin caliber UN-22 was found in a GMT+/- San Marco Big Date.
There is also a caliber UN-24 that is used in the Executive Dual Time GMT. The difference between the two is that the UN22 has a central second hand and the UN24 has a small seconds feature.
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