Girard Perregaux Gyromatic
From Chronopedia
Girard Perregaux Gyromatic
The Gyromatic was the marketing term for an automatic movement used by GP. It was employed for many years and seen in date and non-date movements. The jewel count changed over time, with 39 jewel appearing on the dial in 1957 and the full marketing of the Gyromatic jewelled rotor. The dial count was often changed to allow lesser jewel movements to be imported into the USA with reduced taxes.
Movements
- GP 47 is a full-rotor automatic movement based on an ETA ebauche (ETA 1256); a 11 1/12 ligne movement with 18.000 A/h.
- GP 47 and GP 71 are inscribed on the rotor and come with the typical nomenclature for GP movements in the 1950s (like "47 BF 123" or "71 AE 456"). 71 is seen in square-cased models only.
- GP 21/22 are inscribed on the automatic bridge, but no longer on the rotor. And the calibre is indicated by the first 4 digits of the number
- GP 31/32 are inscribed on the plate which holds the rotor.
The Gyromatic evolved into the HF, a high beat version circa 1968. Standard beat rose from 18k to 36k. This movement is now highly collectible, competing with the Longines Ultrachron at the time for the smoothest second hand.
Girard Perregaux Gyromatic Ref 7317
- Circa 1957-68
- Approx 34,000 made in various case materials inc gold, steel, gold capped and gold filled.
- Long tapered lugs and screwback case
- Signed crown
- Movement - calibre GP 22 (base on the Peseux 315A)
Links
- Girard Perregaux
- Switzerland
- Original advert on YouTube https://www.youtube.com/watch?v=qj86clZ4Mz8&feature=youtu.be
