BOOM.  Another titanium Patek Philippe graces the world with its presence.  Well, maybe not the world, but at least one ultra-wealthy individual, right" 
As one who maintains the definitive directory of titanium Patek Philippe watches this off the beaten path topic is of ongoing interest to me.  Yes, I created and maintain the Official Unofficial List of Titanium Patek Philippe Watches: A Compendium — now 12 titanium Patek’s long — do check it out!!! 
So here we go again…the Children Action charity event being a particular favorite of Patek’s to unveil its super-rare titanium-cased timepieces, they are back again in 2018 with a piece unique Calatrava Pilot Travel Time Ref. 5524T-010.  Yep that’s “T” as in titanium, folks.  Christie’s will handle the hammer as this one-of-a-kind watch created by Patek Philippe goes to the highest bidder on October 15, 2018. This is the first and only titanium version of the Ref. 5524 Calatrava Pilot Travel Time is a special piece no doubt, though I highly doubt it will fetch the 6.2 million CHF that the 5208T-010 brought at Only Watch 2017, this could be a 7-digit watch….do you think"

The titanium case has a black dial that is manually executed with a vertical satin finish. It comes on a vintage black calfskin strap with contrast stitching. The sapphire-crystal case back exposes the automatic Patek caliber 324 S C FUS and bears the inscription “Children ...