The model depicted is called "Acqua 24H", ref. no. 254-24/143. Stainless steel with 18k gold markers on the bezel; diameter: 37mm, water resistant to 120 meters.
The movement is indicated as cal UN-25, but is apparentl an ETA 2892A2 base with what could be a Kelek calendar module, displaying a big pointer date and weekdays and montsh in small subdials. The small subdial at six shows a separately adjustable 24 hours-hand, which thus can serve as a second time zone indication.