Four one-of-a-kind Rolex Cosmograph Daytonas have sold at Phillips in London for a combined $49.4 million, in a charity auction that turned the watch world's most famous model into a fundraising vehicle. The "Four Seasons" collection, unveiled at Watches and Wonders in Geneva earlier this year, was auctioned lot by lot, with each watch commanding a price that ranks among the highest ever paid for a modern wristwatch. The "Summer" edition led the quartet at $13.65 million, followed closely by "Autumn" at $13.52 million and "Winter" at $13.20 million. "Spring" was the least expensive of the four at $9.01 million — a figure that would still count as an extraordinary result for any single watch. The average price across the four lots was about $12.35 million. Each Daytona was built around a seasonal theme, pairing precious-metal cases with unusual stone dials and gem-set bezels: white gold with chrysoprase and purple sapphires for Spring, Everose gold with turquoise and pink sapphires for Summer, yellow gold with mookaite and green tourmalines for Autumn, and platinum with blue opal and a blue-to-fuchsia sapphire gradient for Winter. All four run on Rolex's calibre 4131 movement and are certified as Superlative Chronometers. The proceeds go to the Federer Foundation, which funds early-education projects, and Re, a conservation organization, as part of Rolex's Perpetual Planet Initiative. The sale shows how the major houses are increasingly using unique, purpose-built objects to draw collectors and philanthropists into the same saleroom. The Spring edition pairs an 18-carat white gold case with a chrysoprase dial, lepidolite counters and a purple-sapphire bezel — a combination that still drew $9.01 million despite being the least expensive of the four.