Girard Perregaux 4991 Sea Hawk II John Harrison Blue Dial / Yellow Gold (30329)

30329 Girard Perregaux 49910, Sea Hawk II, John Harrison Edition, 18k yellow gold on a strap with an 18k yellow gold deployant buckle, automatic movement, date, power reserve indicator, small seconds, blue dial with applied yellowe gold numerals, luminescent hands, size: 42mm, thickness 14.9mm, sapphire crystal, water resistant to 300 meters, like new with original box and instruction booklet.

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More about Girard Perregaux 4991 Sea Hawk II John Harrison Blue Dial / Yellow Gold

This is an 18k yellow gold Girard Perregaux Sea Hawk II John Harrison Edition 49910. It has an alligator leather strap with an 18k yellow gold deployment buckle, and a scratch resistant sapphire crystal. It has a screwed-down winding-crown at 4 o'clock with a crown guard, and there is a solid case back secured with 6 screws, and engraved with "MANUFACTURE GIRARD PERREGAUX – WATERPROOF 300 M/1000 FT – REF. 4991," and a serial number. The 42mm diameter solid three-body case, curved lugs, and hobnailed unidirectional revolving flat bezel with raised ten-minute elapsed dive times, are polished/brushed. The dial is midnight blue with blue dial with applied yellow gold Arabic numerals at 3, 9, and 12 o'clock, and applied gold baton hour indices around a perimeter gold railway-style minute scale. It includes "broad arrow" gold luminescent hands, a date aperture window between 1 and 2 o'clock, and there is a gold small running seconds dial between 10 and 11 o'clock. There is a semicircular "Up/down" power reserve indication at 6 with a red arrow indicator and red warning sector. It's water resistant to 300 meters/1000 feet, and the power reserve is 45 hours at full wind. The 14.9mm thick case, dial, and movement are all signed.

This Girard Perregaux Sea Hawk II John Harrison Edition 49910 has a mechanical automatic Girard Perregaux calibre 33 RO movement that's rhodium-plated. It's constructed with 27 jewels, and a straight-line lever escapement. It has a monometallic balance adjusted to heat, cold, and 5 positions, a shock absorber mechanism, a self-compensating flat balance spring, and a hacking seconds mechanism for precision time setting.

On the dial of this limited edition Girard Perregaux Sea Hawk II John Harrison Edition 49910 is: "To John Harrison." Harrison (1693-1776), an Englishman, who was a self-educated carpenter and clockmaker who invented the marine chronometer, a device that solved the problem of establishing the East-West position (longitude) of a ship at sea, thus revolutionizing long-distance sea travel by making it much safer.