Patek Philippe Calatrava - 35 MM - Yellow Gold - 3998J

Here's the information you provided about the Patek Philippe Calatrava Yellow Gold Automatic Men's Watch, model number 3998J:

This watch is designed for men and features an automatic self-winding movement with rhodium-plated, fausses cotes decoration, a straight-line lever escapement, a monometallic balance adjusted to heat, cold, isochronism, and 5 positions, a shock absorber, self-compensating flat balance spring, index regulator, and a 21K gold rotor. The 18k yellow gold case measures 35.0 mm and includes concave lugs, while the scratch-resistant sapphire crystal protects the silver dial. The dial features yellow gold dauphine hands, applied faceted gold baton hour index markers, a center sweep seconds hand, and a date window at the 3 o'clock aperture. The watch is paired with a brown leather strap and yellow gold tang buckle, is in mint condition without engravings, and comes with a Patek box and papers. It has been timed to precision on a Witschi watch expert timing machine, runs strong, keeps accurate time, and is covered by an 18-month warranty from SwissWatchExpo, ensuring its quality and authenticity.