Important Collectors Watches, Pocket ...

Geneva, Mar 29, 2009

LOT 277

Master Clock System Patek Philippe, Genève, Model L4011. Made circa 1975.

CHF 15,000 - 20,000

USD 13,000 - 17,000 / EUR 10,000 - 14,000

Sold: CHF 16,800

Very fine and rare, Integrated Electronic T3 Master Clock System with independent minute and seconds comparators in a six-module tower, the clock M1controlled by a radio signal from Prangins Observatory, clocks for summer and winter times, two Model L 4031 units showing the time in six cities of the world. Accompanied by the Patek Philippe manual. Very powerful Master Clock System capable of controlling an almost unlimited number of slave clocks, capable of being regulated to 1/1000 of a second. 1. Antenna
2. minute comparator, constantly comparing if all clocks are running the same in terms of minutes and seconds.
3. Radio controlled clock MI based on radio signal from Prangins Observatory ? showing winter time.
4. Module L 4011 ? showing summer time.
5. Module L 4021 ? volt and amp meters.
6. Module L 4021 ? LED digital clock.
7. Module L 4031 ? with clocks for 3 time zones with stop buttons.
8. Module L 4031 ? with clocks for 3 time zones with stop buttons.
Each unit signed. Dim. 80 x 42.5 x 23 cm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 3

Good
Dial: 3-01

Good

HANDS Original

Notes

The three clock units measure the time separately. Each one is equipped with a quartz-crystal oscillator and electronic dividers. The results are compared in the control unit. If one of the clock units shows a difference, it is automatically switched off. To increase precision the clock system is synchronized each second by the time signal from the Prangins observatory, near Geneva.The radio station with the call letters HBG, located in Prangins, near Geneva Switzerland, is the official Swiss broadcaster of encoded time signals. The location of the antenna is: 46 degrees 24' North, and 6 degrees 15 ' East. It broadcasts at the exact frequency of 75 kHZ, and under good conditions its signal can be received at a distance of up to 1500 kilometers, covering most of continental Europe.
The signal is processed by automatic radio clocks to display the exact time.