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Arnold & Son Chronometry Longitude Titanium 42.5mm Watch
Ref. 1LTAT.F01A.N001U
The 42.5 mm Grade 5 titanium case is 12.25 mm thick, with polished flanks and satin-finished flat surfaces that follow a profile drawn from sailing boat design. The bezel carries 60 notches, a detail borrowed from the fluted rings of Arnold's original marine chronometers, and the screw-down crown sits behind protective guards. A domed sapphire crystal with anti-reflective coating on both sides covers the dial; the case back is also sapphire, revealing the movement beneath. The fern green dial has a vertical satin finish, with applied baton indices and semi-skeletonised hands carrying Super-LumiNova. Power reserve and small seconds are arranged on the vertical axis at 12 and 6 o'clock respectively. The COSC-certified in-house A&S6302 runs at 28,800 vph with a 60-hour power reserve; its rotor is an openworked 22ct red gold form shaped after an 18th-century English frigate prow. The integrated titanium bracelet has domed, mixed-finish links and a titanium folding clasp.
- Reference
- 1LTAT.F01A.N001U
- Brand
- Arnold & Son
- Case size
- 42.5mm
- Case thickness
- 6.65mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Green
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- A&S6302
- Functions
- Small seconds, Skeleton dial
- Water resistance
- 100m
- Bracelet / strap
- Titanium bracelet
- Strap colour
- Green
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 60 hours
Learn more about Arnold & Son
John Arnold was the outstanding English watchmaker of the eighteenth century, and the one who made precision timekeeping practical. Harrison had proved a chronometer could work; Arnold made it manufacturable, and it was Arnold who coined the word chronometer in its modern sense.
His detent escapement and helical balance spring became the basis of marine chronometer design for the next hundred and fifty years. His chronometers went to sea with Captain Cook, and his workshop and his son John Roger Arnold supplied the Royal Navy through the age of sail.
Arnold also made a watch small enough to be set into a ring, presented to George III, which was the technical marvel of its day.
The name was revived in modern Swiss watchmaking and the company now operates from La Chaux-de-Fonds under the same ownership as the movement maker La Joux-Perret.
Modern Arnold & Son keeps to the founder's territory — visible mechanics, tourbillons, dead-beat seconds and true-beat complications, generally with the movement architecture displayed on the dial side rather than hidden behind it.
- 1764
- John Arnold establishes his workshop in London.
- 1772
- Presents a ring-mounted watch to George III.
- 1779
- Coins the term chronometer for his precision timekeepers.
- 1782
- Patents the helical balance spring.
- 1995
- The name is revived in Swiss watchmaking.
Also in 5 collections
This watch appears in Back in Stock (3,914), Automatic Watches (1,556), Green Dial Watches (419), Skeleton Watches (292) and Titanium Watches (149).
Manufacturer’s guarantee
Best of 2 retailers
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 6.65mm is unusually slim for a 42.5mm case
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Arnold & Son Chronometry Longitude Titanium alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 1LTAT.F01A.N001U | G0A41006 | 1-36-12-03-02-71 |
|---|---|---|---|
| Price | £21,400 | £18,100 | £21,400 |
| Case size | 42.5mm | 42mm | 42mm |
| Water resistance | 100m | 100m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Titanium bracelet | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 60 hours | 50 hours | 100 hours |
| This watch |
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Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 100m it is rated for swimming and snorkelling, though not for diving.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 60 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
Cheapest place to buy
Both Goldsmiths and Mappin & Webb list it at £21,400, so choose on delivery and warranty rather than price.
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