Patek Philippe Calatrava Vintage 18k Yellow Gold Watch. New Patek Philippe black leather band and fully serviced with a 2 year warranty thru Jahan Diamonds. Patek Philippe 3445, Reference 3445J, 18k Yellow Gold on a NEW black Strap, Automatic Movement, 37 Jewels, Date, Applied Gold Stick Indexes, Diameter: 35mm, Thickness: 10.5mm.