A FINE PLATINUM SPLIT SECONDS CHRONOGRAPH WRISTWATCH WITH PERPETUAL CALENDAR, REGISTER AND MOON PHASES, Patek Philippe & Co., Genève, NO. 879846, REF. 5004, CIRCA 1999

nickel lever movement (Cal. 27-70Q) stamped with the seal of Geneva, 28 jewels, free-sprung gyromax balance, the silvered matte dial, applied Arabic numerals, 2  apertures for day and month, 3 subsidiary dials for constant second with 24-hour display, 30-minute register with leap year indicator and date combined with the moon phases, circular water-resistant type case with stepped bezel, down-turned lugs, sapphire crystal display back, case, dial and movement signed, with a platinum Patek Philippe buckle.

Ref. 5004 began in 1994 and is not discontinued according to Patek Philippe. The manufacture has only 3 watchmakers working on Ref. 5004, who are also responsible for repairing this complicated model. This explains why production of this reference is very low. Patek Philippe did stop production of Ref, 5004 in 2003 to improve the movement.