Patek Philippe 18K Yellow Gold Annual Calendar Watch (Ref. 5035J) collector's set with Certificate of Origin, two straps, original Box with both inner and outer, tool and leather portfolio with paperwork and booklets. This Annual Calendar watch features: 37mm 18k yellow gold case; cream dial with applied gold Roman Numeral markers, sweep second hand, Day/Date/Month/24-Hour indicators and original sapphire crystal; handmade Swiss automatic 35 jewel movement with Sapphire exhibition caseback, two leather Patek Philippe strap with solid 18k yellow gold tang buckle. Patek Philippe's Annual Calendar watch was first introduced in 1996, and was the world's first Annual Calendar wristwatch. Watch winds, sets and runs at time of cataloguing however no service history is known and no guarantee of working condition or timekeeping.