With Patek Philippe Certificate of Origin confirming the sale of the present watch on 12 April 1994 and solid 18K gold screw back numbered 2'947'192.
Reference 5050, Patek Philippe's first perpetual calendar wristwatch featuring a retrograde date made in series, was introduced at the Basel Fair in 1993, cased in yellow gold only. As of 1995, it was also available in pink gold, white gold and platinum but still exclusively with the silvered dial, applied Roman numerals, an aperture for the phases of the moon, the very first examples with outer railway minute divisions. Following substantial demand from clients, Patek Philippe introduced a second version featuring applied baton indexes, a modified moonphase display now in the form of a circular subsidiary dial and the addition of the designation "Automatic".
Reference 5050 is illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, second edition, p. 296.