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На один вопрос я нашел ответ:
Many sites incorrectly state that the 116520 Daytona caliber 4130 was the first movement to feature the Parachom Bleu Hairspring. Technically a “Parachom” hairspring was indeed first used in Daytona watches starting in 2000, but it wasn’t blued. Improvements and the blue color were came in 2005.
То есть это парахром стоит в 3130, но он не покрашен в синий еще. А еще пишут что Калибр 3131 (который сейчас в Милгаусе и Эйре) - это 3130 но с синим парахромом как раз, типа для бОльших антимагнитных свойств.
А вот из официального коммьюнике Ролекса 2006 года:
ROLEX has developed and patented a new hairspring called PARACHROM. This hairspring is made of a niobium, zirconium and oxygen alloy. It has been used for the Cosmograph Daytona starting from 2000.
In 2005 a blue-coloured version was introduced for the new GMT Master II and the Cosmograph Daytona. It has an even better performance as regards to long-term stability. This blue version has also been patented.
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