This is Ulysse-Nardin Dual Time 42mm.
Unique time zone quick setting and permanent home time display.
Big date display.
Screw down security crown.
Auto movement UN-24, 42 hours power reserve, 34 jewels.
100 metres water resistant
Sapphire crystal.
Very nice watch, and if this is an authentic watch, the retail price is around £4000 in the UK.