PATEK PHILIPPE, GOLD PERPETUAL CALENDAR WITH MOON PHASES, REF. 5040J

Reference 5040 was launched in 1992 and discontinued in 2007. It was available in all gold colours as well as in platinum and is distinguished by its tonneau tortue case, a style typical of the 1920s and 1930s, but much less common in modern times. 1'800 pieces were produced in yellow gold from which around 80 are known form the market. 600 pieces were made in platinum from which 30 are known from the market.