H4 Longitude Timekeeper Automatic steel-green

Description

H4 Longitude Timekeeper – The solution to the longitude problem

Flat automatic watch (9.9 mm) in antique design, based on Harrison’s ship’s chronometer, 28,800 A/h (4 Hz), sapphire crystal, hand tips filled with Superluminova, padded genuine leather strap, stitched, with folding clasp

John Harrison (1693 – 1776) was a trained carpenter who taught himself the art of clockmaking. From 1727 onwards, he worked on the so-called longitude problem and dedicated the rest of his life to solving it. The term “longitude problem” refers to the difficulty in determining longitude when determining the position of ships on the open sea, which regularly had fatal consequences when ships ran aground without orientation. From 1728, Harrison worked on a timepiece that would have an uncertainty of only a few seconds at sea. After many years of tireless work, he achieved what was considered technically impossible for many years with his H4 marine chronometer. With a diameter of 13 cm and a beat rate of 18,000 A/h (2.5 Hz), his clock was revolutionary and, as a lifesaver at sea, is considered one of the most important clocks in the world.

Functions:
The KronSegler automatic watch series H4 Longitude Timekeeper is visually based on Harrison’s ship’s chronometer, but with a diameter of 42.5 mm and a thickness of only 9.9 mm, it is optimized for today’s wearing habits. The flat, fast-oscillating movement running on 24 rubies at 28,800 A/h (4 Hz) makes the steps of the second hand barely perceptible. A modified date display is integrated at the 6 o’clock position.

Design:
The case has many optical features. A new type of IPG-plating, which can be produced for the first time in the colors olivegold and copper, gives the watch an extraordinary, almost antique look. The crown resembles a model of the earth with degrees of longitude and latitude. The lugs on the housing have a curved, inwardly folded shape, similar to the bow waves of a ship. The case is brushed lengthways, the bezel and the waves of the lugs shimmer polished. Just like the original H4, the inner hour scale has Roman indexes and the outer minute scale has Arabic indexes. Instead of the hand shape used in the 18th century for the H4, which is rather impractical and difficult to read by today’s standards, the Kronsegler H4 Longitude Timekeeper has classically elegant hands whose tips are filled with fluorescent Superluminova. The watch is available in 5 model colours with a steel, copper-colored or olivegold case and sandy-coloured, blue and green dials. The watch glass is a sapphire crystal with the highest possible scratch resistance.

Equipment and scope of delivery:
The leather straps with embossed alligator pattern and slightly shimmering finish are blue or brown and padded, stitched. They are also adorned with a KRONSEGLER crest button and fitted with a folding clasp with a safety double pushers. The H4 Longitude Timekeeper is delivered in an exclusive watch box with certificate, detailed booklet and polishing cloth.

Movement:
KS Automatic CAL K 029.024 CITIZEN Base, 24 Jewels, 28.800 A/h, 4 Hz, movement thickness with rotor 4.1 mm, power reserve 38 – 42 hours, decorated movement rotor, date modification 6 o’clock

Main features:

• Model: KS773
• Case: 3-part stainless steel (316L) polished, depending on the model ion-plated in colours copper or olivegold, diameter approx. 42.5 mm, thickness approx. 9.9 mm (without crown/pushers)
• Crown: spherical crown (shape of the globe) with coat of arms
• Bottom: screwed stainless steel/glass with engraving
• Dial: matt enamel
• Indexes: printed in Roman and Arabic
• Hands: depending on the model, copper, blued or gunblack, hour/minute/second hand tips with Superluminova
• Crystal: sapphire anti-reflective
• Waterresistance: 5 ATM
• Strap: padded cowhide leather strap blue or brown with alligator embossing, coat of arms button and safety folding clasp, ion-plated or steel polished