bold limited-edition timepiece represents the third series in Concord��s exploration
This bold limited-edition timepiece represents the third series in Concord's exploration of the tourbillon. Three tourbillons are in action here, each rotating at different speeds to perform distinct gravity-defying functions. Two of them are nested one inside the other while the third tourbillon carriage rotates a separate balance on a single axis in the conventional way, but at the relatively high speed of one revolution every 36 seconds. The hours and minutes are shown on discs rotating against their respective markers, and the seconds appear on a scale around the bi-axial tourbillon. Sapphire and citrine gemstones are used to indicate the power reserve. Eleven color-graded blue sapphires from dark to pale show the power left in the mainspring. When the six yellow citrines appear against the marker, the wearer knows it's time to wind up the watch.

FC & Ceramic
Can someone enlighten me as to the pros & cons of FC & Ceramic? How does ceramic compare to FC? Which material would you say is more preferred?Thanks!

21k Rotor
Hi everyone, Is there a specific reason on why Patek uses 21k gold to build their rotors?Thanks!

Cal. 324 and silicon balance spring?
Hi folks,Does anyone know when silicon balance spring was introduced into 324 movements?

A few (better) shots of my 3970P silver dial
Proud to share some better shots of my new baby! The 3970 is a classic Patek piece that was produced from 1986 to 2004, and with its case size of 36mm I felt like it was perfect for my 6.25 wrist. In fact, I think it's so perfect for me that, well, I already have one in yellow gold (see this thread: .rolexforums/showthread.php?t=281994).Still, I tend to buy in twos just because I have this fantasy that I'll be leaving behind my watches as heirlooms to my two daughters. What should follow a 3970J? Well, I decided that it should, very fittingly, be a 3970 in platinum. Pic 1: It came very nicely sealed, freshly serviced by Patek USA.Pic 2: Very quickly unsealed, I made sure it was nestled quite comfortably and perfectly in its box.Pic 3: What about a close-up of that incredibly legible, perfectly proportioned silver dial? The 3970P usually came with a black dial with diamond markers; it's much more rare to find a 3970P born with a silver dial, and I was fortunate to find one with com