|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|
|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|
||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.