PATEK PHILIPPE. A FINE 18K GOLD AUTOMATIC CALENDAR WRISTWATCH WITH RARE BLACK GLOSS DIAL Model: Calatrava Reference: 3445 Date: Circa 1970 Movement: 37-jewel Cal.27-460 PM automatic, adjusted to heat, cold, isochronism & 5 positions, 18K gold rotor, Gyromax balance, Seal of Geneva, No.1232464 Dial: Black gloss, applied gilt baton hour markers, gilt outer minute divisions, subsidiary seconds at 6, date aperture at 3, gilt pointed baton hands Case: Brushed and polished round, screw down back, No.333147 Strap/Bracelet: Black Patek Philippe alligator leather Buckle/Clasp: Signed 18K gold buckle Signed: Case, dial & movement Size: 35mm - Weight: 49,40gr Accompaniments: Patek Philippe box 注脚 In 1961 Patek Philippe launched the 3445 in four different metal options - yellow gold, white gold, pink gold and platinum. Each material had varying dial options and could come either with a leather strap or metal bracelet. The current example features a highly attractive gloss black dial complimented by its solid 18K yellow case. The 3445 was the first automatic watch by Patek Philippe to have a date and was in production until 1981.