One of the very first 3940 perpetual calendars made by Patek Philippe in 18ct yellow gold... The distinctively stepped sub dials of these early examples are easy to spot, and look far cleaner and more balanced than the watches that followed with the "crosshair" leap year dial. It is no secret that the these outstanding, super slim, grand complications were the choice of Philippe Stern himself... In incredibly crisp condition and still retaining its original caseback sticker, this important watch comes complete with original Patek box, certificate and booklets.