

Exemplifying the true art of watchmaking, the Ref. 5004 is the ultimate example of understated horology. The production of the Ref. 5004 commenced in 1995 and had a long run until it was finally retired in 2009. The reference also had the distinction of employing the last non-Patek Philippe in house chronograph calibre which was produced for them by Nouvelle Lemania.
Composed of 407 parts, the watch houses a calibre CHR 27-70Q, and ingeniously combines a split seconds chronograph and perpetual calendar functions. The split seconds chronograph allows the simultaneous measurement of multiple events beginning at the same time and employs Patek Philippe's patented split seconds disengagement mechanism, accurate within a fraction of a second. The perpetual calendar function features a 24-hour display, leap year indication and precision moon-phases device.
For an example of the reference, see Huber, M & Banbery, A., Patek Philippe Wristwatches, p. 312, Vol. II, Second Edition.