If you missed my first post on the Parachrom hairspring you may want to check out the details of this fabulous development by Rolex in my original post on the topic. Since writing that post I have been patiently waiting to get my hands on a pre-2005 Daytona with the 4130 movement so I could experiment with the hairspring to confirm whether or not it is a Parachrom hairspring. Today, I finally got my chance.
Unfortunately I don’t have access to a mass spectrometer to test the actual alloy of the hairspring, but I did a little experiment. The Parachrom hairspring is supposed to be more resistant to shock and non-magnetic. Below is a little video showing the effect of a magnet on three different hairsprings. The first is a blue steel spring from a 1960s vintage Rolex Datejust with caliber 1575. The second is a Nivarox hairspring from a Rolex Explorer II, caliber 3185, and the last is the white colored Parachrom hairspring from a D Series Daytona with caliber 4130. Upon watching the video it should be fairly easy to see why they stopped using steel hairsprings. The Nivarox was a huge improvement over steel. The Parachrom hairspring, however, truly is non-magnetic. This little experiment in combination with the information I revealed in my previous post confirms for me that although pre-2005 Daytonas had white colored hairsprings they are in fact Parachrom hairsprings.
You may also enjoy this film from Rolex about the Parachrom hairsping
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