Casio G-Shock GM-2110D-4AER Biton The Grandval Atlantique Dual Time

The Grandval Atlantique Dual Time Secteur Bleue lets you track two time zones with its unidirectional bezel graduated over 12 hours

The latter

Advertisements from 1959 stated that it had been chosen by nine out of ten of the "Greats" of mountaineering for its astonishing resistance to the elements and shocks

It is part of the G-STEEL series

and a stopwatch accurate to one-hundredth of a second

Casio G-Shock GM-2110D-4AER Biton The Grandval Atlantique Dual TimeThe Casio G Shock GM 2110D 4AER is a vibrantly designed analog digital watch with an octagonal stainless steel case and a vibrant orange dial. It combines the bold aesthetics and rugged durability that the G Shock line is known for.