Editorial
The 5320G is Patek Philippe's current 40mm perpetual calendar in white gold, running the in-house 324 S Q caliber. It replaced the 5140G in 2017 with a cleaner, fully integrated dial where all subdials sit flush with the dial plane rather than stepping up from it. Collectors drawn to the perpetual calendar complication at a wearable size land here because nothing else at this diameter carries this movement quality.
Patek introduced the 5320G-001 at Baselworld 2017, slotting it above the 5327G in the perpetual calendar lineup. The 324 S Q is a self-winding movement with a rotor that partially obscures the movement but delivers 45 hours of power reserve and the signature Patek perpetual calendar module. White gold is the only metal offered; there is no steel, yellow gold, or rose gold reference in the 5320G family.
The silvery opaline dial with applied baton indices and railroad minute track reads closer to the Grand Complications style than the more classical sector-dial 5327. No significant dial variant exists beyond the original release, which keeps comparisons simple.
Check the date corrector pushers at 2, 4, 8, and 10 o'clock for dents or dings from misuse with a blunt tool; proper perpetual calendar correction requires a stylus and these pieces are routinely abused by prior owners. The 40mm white gold case polishes aggressively and many pre-owned examples show over-polished lugs that bleed into the brushed surfaces. Confirm the movement has not been serviced by an independent without Patek-approved parts, particularly the perpetual cam stack, as incorrect reassembly shows up as date jumps at month boundaries.
Dial authenticity is rarely faked at this price tier, but verify the applied indices have not been re-glued after a crystal replacement job. Water resistance is 30 meters, so inspect the case back gasket condition and ask for service records if the watch has seen any moisture exposure.
