Patek Philippe Calatrava 18K Rose Gold Fancy Lugs Ref. 1585R

DETAILS
Manufacturer: Patek Philippe
Model: Vintage Calatrava
Reference Number: 1585R
Movement: Manual winding
Condition: Good - wear is consistent with age and use, some signs of tarnish on the bezel and lugs
Gender: Men’s/Unisex
Time Period: 1951
Retail / Compare-At Price: n/a collector’s item
Our Best Price: $18,500 

CALIBER
Movement: -
Caliber: 12''120
Jewels: 18

CASE
Case Material: 18K rose gold
Case Diameter: 34 mm
Thickness: 10 mm
Waterproof: n/a
Water Resistance: n/a
Material Bezel: Fixed inclined 18K rose gold
Glass: Acrylic 
Dial: Black (untouched), signs of discoloration on the dial due to age 
Dial Numerals: Raised 18K rose gold Arabic numeral at 12, 3 and 9 o'clock, and lapped dagger-shaped hour indices, minute track around the outer rim 

BRACELET / STRAP
Bracelet color: Black
Bracelet Material: Leather
Clasp: Tang
Clasp material: Rose gold plated

FUNCTIONS
Hours, minutes, subsidiary small seconds dial at 6 o'clock

OTHERS
Round-shaped two-body polished case
18K rose gold applied stick-shaped hours/minutes and small seconds hands 
18K rose gold knurled push/pull crown 
18K rose gold bowed and stepped cylindrical hooded lugs 
18K rose gold solid case back 
The mechanical manual winding Patek Philippe caliber 12''120 movement is rhodium-plated, with fausses-côtes embellishment. It is stamped with the quality Mark of Geneva. It is constructed with 18 jewels, with overcoil hairspring, whiplash fine regulation and 'Parechoc' shock protection, a straight-line lever escapement. It includes a monometallic balance adjusted for heat, cold, isochronism and 5 positions, a self-compensating Bréguet balance-spring, and swan-neck micrometer regulator.
Dial, case and movement are signed. 
Very rare example.
Incomplete (no box, extract form the Patek Philippe archives dated 1951)