Patek Philippe Perpetual Calendar ref 3940J, in yellow Gol
Case: two-body, solid, polished, concave and stepped bezel, case is unpolished with strong hallmarks showing on side of case. Case is fitted with sapphire back
Dial: gilt with applied yellow gold indexes, auxiliary dials for the days of the month and the days of week in Italian, the 24 hours, and the leap year, aperture for the moon phases. 'Dauphine' yellow gold hands. Dial is spotless.
Movemnt. 240 Q, stamped with the 'Poinçons de Genève', rhodium plated, 'fausses côtes' decoration, 27 jewels, lever escapement, Giromax balance adjusted to heat, cold isochronism and 5 positions, shock-absorber, self-compensating flat balance-spring, mobile stud bearer, 22K goldmicro-rotor mounted on ball bearings.
Fitted with a red OEM Patek Philippe strap and Buckle. Dial, case and movement signed.
Diameter. 36 mm.
Reference 3940 was launched in 1985 to replace the reference 3450. The watch was fitted with a brand new calibre; the 240. The first new movement fitted with a micro-rotor in twenty years, and certainly the most advanced of its time. When the 3940 was introduced it was the thinnest automatic perpetual calendar comprising 275 parts, this compact marvel is incredibly thin due in part to the integrated off-centre 22k gold mini rotor. It still remains 30 years later one the leaner calibre across Swiss brands. The 240is certainly one of the the most iconic example of Patek Philippe style and technical skills.
Available in all precious metal, with very similar dial configuration, this reference is generally divided into three series with differences in hour markers or subdials.
The main design variants between earlier and later series include sunken subsidiary dials as opposed to the rather beveled version and a plain leap year dial rather than the one with the quarter separations. Earlier models featured a smaller signature, the designation "Swiss" was printed underneath the beady minute divisions. This was changed in later series with the "Swiss" printing within the ring.
The above watch is a 2nd series example, it retains the sunken dial and the Swiss signature below the beaded markers from the 1st series but has the quarter divider on the month/leap subdial.
The watch is in excellent condition, and represents tremendous value at this price.
Production of the 3940 ceased in 2007, replaced by the reference 5140.