Greetings,

Just a quick note to let everyone know I've reached out to my contacts at Rolex USA to try and get some clarity on the Parachrom Bleu hair spring on the Daytona. Here's what I've been able to determine:

-The Parachrom hairspring was actually developed by Rolex in the late 1990's. So from that perspective, it is entirely possible that it could have been incorporated on all 4130 equiped Daytonas (debuted in 2000).

-The head watchmaker at Rolex UK is reportedly saying that the the Parachrom hairspring has always been on the 4130 (this report makes sense because it matches up to information James Dowling has been given and reported...James is UK based).

-When it has been pointed out to him that there are many documented photographs of a non-blue hairspring on various serials of 4130 equipped Daytonas, the indication is that the Parachrom hairspring has not always been blue. This doesn't make sense to me - the blue color is a physical property of the two elemental metals which are combined into the Paracrhom alloy which, when it hits oxygen, turns blue.

In any event, I've sent some photos and they're running the issue up the flag pole...I'll report back when I get an answer. My theory remains that the Parachrom bleu hairspring didn't debut on the Daytona until sometime after the F serial production.