The date aperture is a porthole design
This watch has been certified at Certifiwatch under registration number CF-0103631
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the lume is zinc-sulphide
each virtually identical (except a few minor modifications on a brand-by-brand basis) and they were put into production- and these from the house of Patek are rare
Patek Philippe Perpetual Calendar ref. 5140J with extract of the archives 1993 The date aperture is aIn the world of complicated watches, particularly in the realm of perpetual calendars, Patek Philippe holds the crown. The 5140J, introduced in 2006, succeeded the iconic Ref. 3940, which is now considered one of the most significant watches in Patek Philippes modern history. However, in our opinion, the 5140 is greatly underrated and is actually a crown jewel for the future. While continuing the legacy of the micro rotor calibre 240 Q, the 5140J