Patek rarely makes titanium-cased timepieces, so each one is noteworthy. That's certainly the case for Ref. 5270T-010, the first time their flagship Perpetual Calendar Chronograph has appeared in the lightweight metal. To further its exclusivity, it has an original emerald green sunburst dial, which matches the stitching on the glossy black alligator leather strap with a titanium fold-over clasp. It's powered by a CH 29-535 PS Q caliber movement that's visible through the sapphire crystal case back, which bears the inscription "Children Action 2022" to denote the event for which it was made; it will come with an interchangeable sold titanium case back. The one-of-a-kind watch will be sold at the Children Action charity auction in Geneva on November 7th, with proceeds going to benefit impoverished children around the world.