Arnold & Son / Longitude
Arnold & Son Longitude
Collection profile · 2024
Longitude is Arnold & Son’s chronometry-led sports watch family, explicitly inspired by John Arnold’s marine chronometers and the historical quest to calculate longitude at sea, with COSC-certified manufacture movement A&S6302, a 42.5 mm titanium case, and power-reserve plus large small-seconds display.
Why it matters
Longitude translates Arnold & Son’s historical identity into a modern sport-chic chronometer: rather than repeating a vintage marine chronometer literally, it turns the brand’s navigation heritage into an everyday titanium watch with certified precision and distinctively vertical dial architecture.
Key references
Collection timeline
- 2024 — Arnold & Son launched the Longitude collection as a contemporary interpretation of John Arnold’s marine chronometers, centered on a COSC-certified calibre and maritime design cues.
- 2024 — The core Longitude Titanium model established the family’s 42.5 mm titanium architecture, integrated bracelet, power-reserve display, and large seconds layout.
- 2024 — Longitude Titanium 5°W followed as a limited edition of 38 pieces, linking the line even more directly to navigation history and Cornwall through its Lizard Point Grey dial.
FAQ
What is the main inspiration behind Arnold & Son Longitude?
The collection is a tribute to John Arnold’s marine chronometers and to the historical problem of determining longitude at sea, expressed through maritime case design and a chronometer-certified movement.
What movement powers the Longitude collection?
The official collection and model pages specify the in-house automatic calibre A&S6302, a COSC-certified movement with 60-hour power reserve, 4 Hz frequency, and power-reserve plus small-seconds indications.
More from Arnold & Son
- UTTE (Ultra Thin Tourbillon) — Arnold & Son’s UTTE, now presented as Ultrathin Tourbillon, is the brand’s ultra-thin flying tourbillon family, first launched in 2013 and defined by an off-centred display, marine-chronometer-inspired layout, and one of the slimmest hand-wound tourbillon calibres of its era.
- HM Perpetual Moon — Arnold & Son Perpetual Moon is the brand's astronomy-focused moon-phase collection, spanning 41.5 mm and 38 mm precious-metal references with large moon displays.
- Constant Force Tourbillon
— Arnold & Son’s Constant Force Tourbillon line is a chronometry-led high-complication family combining a patented constant-force mechanism, dead-beat seconds and a tourbillon regulator, explicitly tying modern wristwatch construction to John Arnold’s marine-chronometer legacy and his historical link with Abraham-Louis Breguet. - TB88 — The TB88 is Arnold & Son’s 2012 deadbeat-seconds chronometer, named for its symmetrical “double eight” architecture and built as a modern wristwatch tribute to English marine chronometer construction associated with John Arnold.