Gyromatic ( Greek word γύρος gyros , rotation ‘and automatic’ ) refers to a series of Girard-Perregaux watches produced between 1957 and 1979.
The Gyromatic are self- winding watches . The first models contained 21 or 22 series calibres , with a defined pendulum frequency of 18,000 vibrations per hour. From 1962 onwards, the Gyromatic were fitted with 32 series gauges and their frequency was increased to 21 600 rpm (with the exception of the 32.7 and 32A gauges). The calibers of the 32 and 42 series are based on Anton Schild ‘s AS 1687/1688 calibres . The automatic winding was developed by Girard-Perregaux in collaboration with Doxa SA , Eberhard & Co. ,
As early as 1966, the Gyromatic were built with the 32.7 calibres (in small numbers) and 32A models, which had a pendulum frequency of 36,000 a / h , which made it possible to improve the precision of the movement of the watches. These gauges had a diameter of 11.5 lines and were named Gyromatic HF ( High Frequency ). They incorporated a micrometric adjustment screw, dry lubrication (without oil), a Clinergic 21 pendulum , an Isoval type spring and a mono-metal pendulum.
Between 1966 and 1967, 662 Gyromatic were built with the caliber 32A , based on the original caliber of 1957 [precision needed] . This caliber had a frequency of 36 000 a / h . All these watches were sent to the Official Offices for the Control of Watches (BO), to be inspected for fifteen hours in six positions and three different temperatures. All the 662 Gyromatic were certified chronometers with the comment ” results particularly good” and sold under the name Gyromatic Chronometer HF .
Of these 662 watches, 40 were selected and handed over to the Neuchâtel Cantonal Observatory for certification. The 40 Gyromatic were inspected over a period of 40 days before receiving a certificate and were sold under the name Girard Perregaux Observatory Chronometers . In Neuchâtel, these 40 watches represented 73% of the certificates issued for the year 1967 1 and the observatory will award the Centennial prize at the Girard-Perregaux house in recognition of the precision of its models 2 , 3 .
From 1968 the caliber 42 was introduced, with a power reserve of 40 hours and a stop-seconds mechanism, it is developed exclusively for Girard-Perregaux by Anton Schild. Between 1970 and 1979, the 440 and 441 gauges ( 12.5 lines ) were also developed exclusively for Girard-Perregaux by Anton Schild, they have a quick date change by pressure on the crown and a micrometric adjustment screw . In 1974, a stainless steel Gyromatic was traded in Germany 520 Deutschemark .
Crisis of Quartz
In 1969, Girard-Perregaux began developing quartz clocks and defined a standard frequency of 32.768 Hertz . The very high precision of these electronic clocks will switch the watch industry in the quartz crisis .
- Advertisements of the 1966 Gyromatic HF [ archive ] .
- Tim Siragusa: Insider’s Story – The 1967 Girard-Perregaux Gyromatic Chronometer HF Caliber 32A [ archive ]
- ↑ The Illustrated London News , Band 253, Ausgabe 2. Illustrated London News & Sketch Limited, 1968, S. 19.
- ↑ Paolo De Vecchi: Orologi da polso: Conoscere and collezionare il meglio dell’orologeria da polso del XX secolo. De Agostini, 2012. ( ISBN 9788841876930 ) . S. 62.
- ↑ PB, « Short comment: Always more precision! ” The Impartial ,, P. 7 ( read online [ archive ] )