The G10 was released in 1980 by Cabot Watch Company (CWC), the firm Ray Mellor founded in 1972 after serving as UK managing director of Hamilton. It was a battery-powered, no-date general service watch for the British armed forces, and its name comes from the military G Series stores and inventory form. An issued example reviewed by Worn & Wound measures 36.5 mm without the crown (38 mm with it), 42.5 mm lug to lug and 10 mm thick including the domed acrylic crystal, with 19 mm fixed spring bars, a matte stainless steel case, a push-in crown and 5 ATM water resistance. That watch runs on an ETA-ESA 955.114 quartz calibre powered through a battery hatch in the caseback. The matte black dial has white Arabic numerals, a triangle at 12 and an encircled “T” indicating tritium lume. The caseback carries the broad arrow, the code 6645-99 (time measuring instrument, United Kingdom) and the NATO stock number 5415317.

The G10 marked the move of British military issue watches from mechanical to quartz movements. Gear Patrol notes that early cases were deeper to house the older, larger quartz movements, which is why collectors call these first examples “Fat Boy” models. The plain “CWC” logo was replaced by the encircled oval logo in 1982, which helps date surviving pieces. The fixed bars were designed for a single-pass NATO strap, and the simple, legible layout suited every branch of service: the Worn & Wound example carries the Royal Navy code 0552 and an issue year of 1988. Gear Patrol reports estimates that more than 200,000 CWC watches were issued by the Ministry of Defence, including over 20,000 to the Royal Navy in 1991 alone. Mellor sold the business to Silvermans in 1996.

For collectors, the G10 is one of the most accessible pieces of genuine military history. Worn & Wound praised its practicality, its proportions and its provenance, describing it as minimal with charm, while noting that the tritium lume has faded with age and that the non-screw-down crown makes the 5 ATM rating feel modest. Worn & Wound also highlighted that issued examples can still be found at a solid price, which has made the G10 a common first military watch. The original 1980 issue version is no longer made, but Cabot Watch Company has kept the G10 in its range, with Gear Patrol reporting modern G10s on sale for civilian buyers.