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Important Modern & Vintage Timepieces

Geneva, Nov 08, 2020

LOT 222

LONGINES, REF. 4356, WEEMS, NAVIGATION, ENAMEL DIAL, STEEL

A very fine, rare, large, manual wind navigation wristwatch with inner rotating minute disk.

Brand Longines Wittnauer

Model Weems

Reference 4356

Year Invoiced to Wittnauer on February 2nd 1945

Movement No. 6499919

Case No. 22326

Caliber 37.9N

Dimensions 47 mm

Signature Dial, case and movement

Accessories Extract from the archives

CHF 5,000 - 8,000

HKD 40,000 - 64,000 / USD 5,000 - 8,000

Sold: CHF 10,875


Grading System
Grade: AA

Very good

Case: 3-8

Good

Slightly scratched

Movement: 3*

Good

Overhaul recommended, at buyer's expense

Dial: 3-71-01

Good

ENAMEL AND VARIOUS TYPES OF DECORATION Hairlines

HANDS Original


Notes

The hour angle system was invented by Philippe Vanhorn Weems of the Annapolis Naval Academy, an authority in the 1920s and 30s. He trained the famous Charles A. Lindbergh, who set the record for the first non-stop transoceanic flight. This watch bears a large ball-shaped winding- crown, enabling the watch to be wound by a pilot wearing gloves. It is practically impossible to build a commercial timepiece which will keep
time to the exact second under the conditions met in a ship or in an aeroplane. The unavoidable variation in the chronometer from true time necessitated an extra calculation in navigation to compensate for this chronometer error. Weems noted that in an airplane moving at speeds of 200 to 300 miles an hour or more, the time required for calculating chronometer error was a danger that should be eliminated. Since the high gear radio made it impractical to set the second hand to the dial, Weems chose to set the dial to the hands. The seconds dial in the center of the watch is rotated by depressing the small stem. For navigation purposes, the Greenwich Mean time is indicated directly. The Longines Weems Watch

is made in two models. The smaller model is useful not only for sea navigators and aircraft pilots, but particularly radio broadcasters as well as others, such as civil engineers who require exact time.