CNN —Auction house Christie’s in New York is set to offer up its most expensive watch ever – a limited-edition Richard Mille – alongside rare timepieces, such as ones that once belonged to a former US president and an Apollo 7 astronaut. The transparent Richard Mille wristwatch, with a complex sapphire case design and sapphire crystal skeletonized tourbillon, is expected to sell for up to $4 million at auction at Christie’s Rockefeller Center on June 10. “We are particularly enthusiastic about offering the Limited-Edition Richard Mille RM56-02 AO Tourbillon Sapphire, a remarkable achievement in both pioneering materials and micro-engineering,” Rebecca Ross, head of sale at Christie’s in New York, said in the release. Another limited-edition Richard Mille watch, with a diamond-set skull, will be the first of its kind to be brought to auction and is expected to fetch up to $1 million, according to Christie’s. The Rolex Daytona watch was reportedly worn by late NASA astronaut Walter Cunningham in space.

---

Persons: Richard Mille –, Mille, ” Christie’s, Richard Mille RM56, Sapphire, ” Rebecca Ross, Richard Mille, Paul Newman, Walter Cunningham, Cunningham, Philippe, Lyndon B, Johnson, Robert Kerr, –, ” Ross Organizations: CNN, Christie’s Rockefeller Center, NASA, Rolex, Tiffany Locations: New York, Hong Kong