Caliber SW330-2

Sellita's self-winding GMT calibre in its SW300 family, adding a central 24-hour hand for a second time zone to hours, minutes, centre seconds and a date. Sellita's catalogue lists both the date and the GMT hand as quick-set from the crown. It gives 25 jewels, 4 Hz, a typical reserve of 56 hours, and an 11½-ligne movement 25.60 mm across and 4.10 mm thick. Read against a rotating 24-hour bezel, the same hand can track a third zone.