extrait de la faq de ospog
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écrit par VT le 05 mars 2004 17:46:16:
en réponse à: Re: 861/1861 écrit par Dumbo le 05 mars 2004 17:17:42:
Q8. What is the difference between the different movements used over the years?
A8. The Omega cal 321 used from 1959 to 1968 uses a column wheel for the chronograph function. The successor, the cal 861 uses a shuttle/cam system instead. The cal 861 also meant a increased frequency on the balance wheel from 18000 Hz to 21600 Hz, 17 jewels (18 jewels from 1993) and the use of a flat balance spring. There was also two other versions of the caliber 861, the 861 L (Luxe) from 1980 and the 861 S (Squelette) from 1983. The cal 861 was followed by the currently produced cal 1861 (rhodium plated) in late 1995. There was/is also display back versions of the 861/1861 called cal 863/1863 that has more decoration and foremost a metal lever for stopping the chronograph (the 861/1861 uses a plastic one that in fact is better technically speaking because it is "more friendly" to the teeths of the wheel it's affecting).
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