Even rarer than the platinum model, the yellow gold 5970 has the shortest production run of this important perpetual calendar chronograph. Regarded by many collectors as the last great Patek grand complication of the Philippe Stern era, only a few hundred were produced in 18ct yellow gold, and pristine full set examples like this are important additions to any serious watch collection. Complete with polished wood box, Patek Philippe service history, certificate of Origin, spare case back, stylus and booklets.