PATEK PHILIPPE, REF. 3919/5, CALATRAVA, A VERY FINE 18K YELLOW GOLD WRISTWATCH WITH SUBSIDIARY SECONDSCIRCA: 1989CASE MATERIAL: 18k Yellow GoldCASE DIAMETER: 33.5mmMOVEMENT NO’: 1.815.861CASE NO’: 2.859.904BRACELET MATERIAL: 18k Yellow BRACELET SIZE: 165 mm Approximate Overall Length, Integrated Bracelet DIAL: White     MOVEMENT: Manual BOX: NoPAPERS: NoACCESSORIES: A Patek Philippe Extract from the Archives Patek Philippe introduced the reference 3919 in 1985 and was in production until 2006. Patek offered this model in yellow, pink, and white gold. This particular example is cased in yellow gold with an integrated bracelet. One distinguishing feature of the 3919 is the hobnail bezel. The 3919 is a modern classic Calatrava, great for many occasions.