Ulysse Nardin Caliber UN-22

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.