Patek Philippe Celestial Reference 5102 The reference 5102 represents Patek Philippe's Celestial within the Sky Moon Celestial series, distinguished by its Northern Hemisphere sky chart complication. This astronomical timepiece displays celestial configurations alongside traditional timekeeping functions. The model was produced from 2002 to 2019, establishing its place within Patek Philippe's complicated watch offerings. The 43mm case is crafted in 18k white gold with a smooth bezel and sapphire crystal. The blue celestial dial houses the automatic caliber 240 LU CL movement, providing 48 hours of power reserve. Water resistance extends to 30 meters, and the watch is fitted with an alligator leather strap. This reference appeals to collectors seeking astronomical complications and celestial display functions. The 5102 occupies a specialized position within Patek Philippe's catalog, combining the brand's movement expertise with astronomical indications. The production span of seventeen years indicates sustained collector interest in this particular celestial configuration.