Patek Philippe Calatrava 18K Yellow Gold Ref. 3820J

$10,950.00 USD

Manufacturer: Patek Philippe
Model: Calatrava
Reference Number: 3820J
Movement: Manual winding 
Condition: Very good
Gender: Men’s/Unisex
Time Period: 1983 
Retail / Compare-At Price: n/a collector’s item
Our Best Price: $10,950 

Movement: -
Caliber: 177T
Jewels: 18


Case Material: 18K yellow gold 
Case Diameter: 32 mm
Thickness: 6 mm
Waterproof: 100 ft./30 m.
Water Resistance: 3 ATM
Material Bezel: Fixed 18K yellow gold
Glass: Sapphire crystal
Dial: Silver
Dial Numerals: 18K yellow gold applied Arabic hour indices, embossed dot minute markers around the outer rim 

Bracelet color: Black
Bracelet Material: Leather
Clasp: Tang
Clasp material: 18K yellow gold 

Hours, minutes, 44-hour power reserve

Round-shaped case
18K yellow gold applied Bréguet-shaped hands
Original 18K yellow gold Patek Philippe buckle
Downturned tear drop lugs
18K yellow gold two-body, solid, polished screw-down case back
18K yellow gold push/pull Patek Philippe Calatrava crown 
Patek Philippe Genève signature at 12 o'clock
This ultra-thin caliber 177 hand-wound movement is based on a 90 year old from F. Piguet abd remains in production today. In fact, Patek Philippe used F. Piguet ebauche to produce their own ultra-thin 9 ligne watch movement. Patek Philippe obviously modified the movement extensively, as they added their patented free-sprung Gyromax balance adjusted for heat, cold, isochronism and 5 positions, with a shock absorber device. It is stamped with the Seal of Geneva Quality Mark.
Dial, case and movement are signed. 
This mechanism oscillates at the frequency of 21,600 vph (3 Hz).
This reference was produced during the 1980's -1990's.
Incomplete (no box, with extract from the Patek Philippe Archives dated 1983).