Patek Philippe, Calatrava, Ref. 3541J

The reference 3541 was produced between 1961 and 1967 and is referred to as a "Monodate" featuring an automatic movement with subsidiary small seconds and a date aperture. It was predominantly cased in yellow gold and occasionally in white gold.  SPECIFICATIONS  Brand: Patek PhilippeModel: Calatrava Reference Number: 3541JMovement: AutomaticGender: Men'sCondition: Very good (worn with little signs of wear)Time Period: 1966Box: NoPapers: Extract from Patek Philippe Archives THE CALIBER Caliber: 27-460MJewels: 37 THE CASE Case Material: 18K yellow goldCase Diameter: 36 mmThickness: 10.5 mmWaterproof: Bezel Material: Fixed 18K yellow gold Glass: Acrylic (apparent scratches on the glass that can be eliminated by polishing the crystal)Caseback: SolidDial: Silver with radial brushing Dial Numerals: Yellow gold applied baton hour indices, outer perlé minute track around the outer rim THE BRACELET / STRAP Bracelet Material: Black LeatherBuckle: TangBuckle Material: Gold plated THE FUNCTIONS Ho