Patek Philippe Calatrava 18K Rose Gold Fancy Lugs Ref. 1578R

DETAILS
Manufacturer: Patek Philippe
Model: Vintage Calatrava
Reference Number: 1578R
Movement: Manual winding
Condition: Very Good - wear is consistent with age and use, some signs of tarnish on the bezel
Gender: Men’s/Unisex
Time Period: 1948
Retail / Compare-At Price: n/a collector’s item
Our Best Price: $16,850 

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

CASE
Case Material: 18K rose gold
Case Diameter: 35 mm
Thickness: 9.8 mm
Waterproof: 80 ft./25 m.
Water Resistance: 2.5 ATM
Material Bezel: Fixed 18K rose gold
Glass: Domed acrylic 
Dial: Silver, 18K raised bead at 6 o'clock 
Dial Numerals: Raised 18K rose gold Arabic numeral and lapped dagger-shaped hour indices and black minute track around the outer rim 

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

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

OTHERS
Round-shaped case
18K rose gold applied stick-shaped hours/minutes and small seconds hands 
18K rose gold knurled push/pull crown with Calatrava cross engraving
18K rose gold spider lugs exhibiting beautiful angles and a crisp hallmark on the  inside of the top left one
18K rose gold solid snap-on case back 
The mechanical manual winding Patek Philippe caliber 12''120 movement is rhodium-plated, with fausses-côtes embellishment. It's stamped with the quality Mark of Geneva. It is constructed with 18 jewels, and a straight-line lever escapement. It includes a monometallic balance adjusted for heat, cold, isochronism and 5 positions, a self-compensating Breguet balance-spring, and a micrometer regulator.
Dial, case and movement are signed.
Patek Philippe produced the reference 1578 from 1943 until approximately 1965.
Like its chronograph counterpart ref. 1579, ref. 1578 is immediately distinguished by its faceted "spider lugs". The model was cased in yellow, pink and white gold, featuring both subsidiary seconds and centre seconds. 
Incomplete (no box, extract form the Patek Philippe archives)