H4 Longitude Timekeeper Automatic steel sand

Description

Slim men’s automatic watch with sapphire crystal, date display, leather strap, and folding clasp. Available in five different colors.

The purpose of John Harrison’s longitude marine chronometer was to measure time accurately on the high seas in order to determine geographical longitude. Easier said than done. Harrison spent almost his entire life developing a ship’s chronometer suitable for use on the high seas before finally succeeding.

Kronsegler H4 Longitude Timekeeper: From 2,5 to 4 Hz

The slim, fast-oscillating movement with 28,800 vph (4 Hz) is mounted on 24 jewels and operates at a significantly higher frequency than Harrison’s clock, making the movements of the second hand barely perceptible. The spherical crown allows the watch to be easily adjusted or wound if necessary – however, the smooth-running, decorated rotor also ensures a constant supply of energy.

A marine chronometer as inspiration

Just like the original H4 ship’s clock, the inner hour scale features Roman numerals and the outer minute scale features Arabic numerals. A modified, framed date display is integrated at the 6 o’clock position and can be quickly set using the easy-to-find center crown position.

All variants:

Technical details:

• 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

Mechanical movement:

• KS Automatic CAL K 029.024 CITIZEN base, 24 jewels, 28,800 vph, 4 Hz
• Movement thickness with rotor 4.1 mm
• Power reserve 38–42 hours
• Decorated rotor
• Date modification at 6 o’clock