The Langdon GMT
- Case
- 41mm Stainless steel 316L, polished bezel, brushed case body, 11.6mm thick
- Dial
- Sunray midnight blue (matching the Hampstead Blue palette by design) with a sharper graining to read as more sporting. Applied polished-steel indices with cream-toned LumiNova. Dauphine hands for hour and minute. A fine pencil-tip GMT hand in rose gold, pointing to a 24-hour scale printed on the dial's outer chapter. Date at 6 o'clock. Also available with a dark chocolate-brown sunray dial.
- Movement
- A&F calibre HF-402 (Sellita SW330-2 (flyer / true GMT configuration))
- Power reserve
- 56 hours
- Water resistance
- 100m
- Crystal
- Flat sapphire, double internal anti-reflective coating
- Strap
- Hand-stitched navy alligator (blue dial) or cognac calfskin (brown dial), 20mm, signed polished steel deployant clasp.
Heritage
The GMT was the first Langdon complication and started as a personal project — Harold's wife works across multiple European time zones and complained for two years about every GMT watch he owned. The flyer mechanism (local hour jumps, not the 24 hand) was non-negotiable from the first sketch. A long-form journal entry on the development of the GMT is available in the Journal section; clients asking about the piece often appreciate the context.
Design
The Langdon collection's brief is "complications that are still small enough to wear under a shirt cuff." The GMT is 41mm and under 12mm thick — the lower end of modern GMT sizing, which was a hard constraint. Harold considered a 40mm case and rejected it as making the 24-hour scale illegible without compromise.