Patek Philippe Calatrava 3445 Double Signed Serpico y Laino with PapersA special double signed Calatrava We are delighted to be offering this rare reference 3445 Calatrava in 18k yellow gold. The watch is fitted with a nice simple silver dial, with small seconds at six, an "inversed" loupe for the date function and simple stick markers. We believe this inverse louped glass is a later replacement . The screw back case, with beautifully curved lugs, remains in excellent condition. This is a very special 3445 that features