The 5905P has a mixed heritage, as it draws upon two previous annual calendar pieces, the reference 5960 and the reference 5205 respectively, as demonstrated by its blended reference number. The watch borrows the sectors and elongated indexes found on the 5205, while retaining the overall dial layout and sub-seconds style of the 5960.
This 5905P has a deep navy sunburst dial, appearing in lighter hues when exposed to direct light, three calendar apertures displayed across the top of the dial, with day, date, and month placed from left to right, as is typical with Patek’s annual calendars. The 60-second sub-dial found at 6 o’clock also includes a discreet day/night indicator placed just above the 30 second marker.
The lume-filled, dauphine-shaped hands found on the 5905P are not derived from previous references, but are a new addition that is pleasingly modern. Further to this, as opposed to the round pushers found on previous generations of the annual calendar, this 5905P sees them replaced with flat pushers, allowing for a sleeker look.
The watch is powered by the calibre CH28-520, an automatic movement which can be viewed from the sapphire caseback. The movement also bears the Patek Philippe seal on the rotor, which guarantees the movement’s accuracy.