
Wristwatches · Wristwatch
IWC Automatic Calatrava 18K YG "Cal. 8521", 1950s
- Maker / attribution
- IWC (maker)
- Date
- 1950s
- Historical period
- Modern Mechanical Horology (1945 – 1969)
- Country of origin
- Switzerland
- Object type
- Wristwatch
- Stock no.
- IWC18KCAL8521
- Credit line
- Dealer listing, Craft & Tailored (IWC18KCAL8521)
- Catalogue title (original)
- 1950s IWC Automatic Calatrava 18K YG "Cal. 8521" (English)
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Record summary
Catalogued by Craft & Tailored (dealer), Los Angeles (stock number IWC18KCAL8521), this is a wristwatch by IWC, made in Switzerland, dated 1950s. The Atlas places it in the Modern Mechanical Horology period (1945 – 1969) of its Wristwatches collection. The record is illustrated with 6 photographs.
Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.
Catalogue description
Dealer description — Craft & Tailored
Founded more than 150 years ago, the International Watch Company has grown to become one of the most recognizable Swiss watch brands on the planet. One of the things they're especially famous for is their "Post-War" in-house movements, manual and automatic mechanical masterpieces which are long-time favorites among the watch community and IWC enthusiasts alike. IWC’s Caliber 8521 originally came into production post-war, in 1952. Featuring the Pellaton winding system which was a new and extremely efficient movement system for perpetual automatic wristwatch movements. This innovative movement was patented by IWC in 1950 and we saw the first mass production of these watches in 1952. The Pellaton winding system is still used in IWC watches today and has been improved upon ever since. Surrounding the heartbeat is an absolutely beautiful yellow gold Calatrava-style case and dial. It's as classic—and classy—as they come and would look good on any wrist, in pretty much any setting SPECS Stock # IWC18KCAL8521 Brand IWC Style Automatic Calatrava Model Cal. 8521 Serial 14XXXXX Size Men's Material 18K Yellow Gold Dial Gold Millimeters 34.5 Bracelet 2pc Handmade Leather Strap CASE & BRACELET The elegant yet robust 18K yellow gold case features long, broad lugs that extend the overall dimensions of the watch. The case exhibits nominal evidence of previous polishing as the lugs remain extremely thick with strong factory dimensions and angles throughout. Signs of very gentle use are present throughout the case as well. The case retains its original IWC fish logo crown. The snap-on case back is in excellent condition. The watch comes supplied on a 2pc handmade leather strap. DIAL & HANDS The original satin gold "pie-pan" dial is in wonderful condition with a charming vintage aesthetic, showing some expected elements of age concentrated at the center of the dial. The radium lume plots remain mostly intact throughout the dial though degradation is present under UV light inspection. The original yellow gold dauphine-style hands have been professionally restored with radium and display a pale grey coloration. ACCESSORIES
Historical context
Modern Mechanical Horology (1945 – 1969)
Tool watches for divers, pilots and astronauts; electric watches anticipate the electronic age.
The classic era of the mechanical wristwatch: dive watches, chronographs for motor racing and space flight, GMT watches for jet travel, slim dress watches, automatic calendars, and the rise of Japanese manufacturers alongside Swiss, American, German and Soviet industries.
Read the period in the timelineMore wristwatches from this periodEarlier: Golden Age of Mechanical Watchmaking
Atlas type guide
Automatic (self-winding) watches
Self-winding watches use the wearer's motion to wind the mainspring. Abraham-Louis Perrelet and Breguet made 'perpétuelle' pocket watches with oscillating weights in the late eighteenth century, but the principle only became practical in the wristwatch. John Harwood patented a bumper automatic in 1923; Rolex's Perpetual rotor (1931) winding in one direction, and later bidirectional rotors (Eterna, Felsa Bidynator), established the modern form. Micro-rotors (Universal Genève, Buren) and peripheral rotors made automatic watches thinner.
What to look for
- A semicircular rotor turning 360° over the movement, or a 'bumper' weight that rebounds between springs.
- 'Automatic', 'Perpetual' or 'Self-winding' on the dial.
- A sealed screw-back case, since automatic watches are wound less often by the crown.
Dating clues
- Bumper automatics: 1923–c. 1955.
- Full rotors: from 1931 (Rolex); widespread after c. 1950.
- Micro-rotors: from 1954–1958.
General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.
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