With their sapphire case-back protected by a hinged cover and straight lugs, Patek Philippe Officer’s-style perpetual calendars with retrograde date hand are among the most sought-after models for devotees of rare timepieces – especially when they feature an entirely hand-engraved case, as on this rose gold Rare Handcrafts model. Maker: Patek Philippe. Reference: 5160/500R-001. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.