Released in 1994 and produced until 1999, the ref. 5015 is an exceptionally rare example of a Patek Philippe Calatrava Officer's Watch. It even has the title of being the first Patek moon phase timepiece that does not feature a perpetual calendar. With 3000 units made across a selection of metals, it features an incredible 36mm 18kt case construction with its signature sapphire crystal exhibition hinged-caseback, stepped beaded bezel, and iconic scrolled lugs with a case-matching 18kt white gold buckle. Continuing the same level of intricate detail as its 18kt white gold case, the ref. 5015G features a stunning white enamel dial with black painted radial Arabic numerals, a black oxidised gold spade handset, and a railway-style minute track found along its periphery. With a running sub-seconds dial at 4 o'clock, a moon phase aperture at 7 o'clock and a semi-circular 48-hour power reserve indicator at 10 o'clock, the 5015G's asymmetrical dial layout is immediately reminiscent of the modern Nautilus ref. 5712, and all thanks to its automatic cal. 240-152 movement, which is proudly on display behind its exhibition caseback, which is protected by its hinged 18kt white gold caseback.

Still a rich part of Patek's historical offering, the ref. 5015G was discontinued in 1999, but it looks like it could have come from the middle of the century with its heritage-inspired looks and aesthetics.