IWC Jumbo watch International Watch Co. Schaffhausen Pellaton Cal 8531

SPECIFICATION

Reference : IWC Jumbo
Movement : Calibre 8531
Age : circa 1958
Case Size : 35mm
Case Thickness : 10mm
Lug to Lug : 42mm
Lugs : 18mm
Condition : used IWC watch
Box & Papers : No
Case Material : Stainless Steel
Warranty : 12-Months Warranty

POINTS TO MENTION

• In great pre-owned condition, with light wear from use
• Case and bezel have light scratches and marks
• Dial has some light blemishes
• Fully serviced Pellaton movement
  
• Paired with an unworn Brown leather strap

THE WATCH

We have here a stunning IWC Jumbo, with a fantastic sunburst dial, steel baton hour markers complement the sword style hands and steel date window which pull the whole design of the watch together. This watch is powered by the Automatic calibre 8531, that has a beat rate of 19,800 and 21 jewels, which sits in the round stainless steel, 35mm Jumbo case. The watch is paired with a brown leather strap.

A BIT OF TRIVA

An automatic watch keeps running only because of the movements of the wearer’s arm. For 60 years now, the power driving IWC’s automatic in-house movements has come from the pawl-winding system developed by Albert Pellaton and improved continuously ever since. In an automatic watch, the rotor converts kinetic energy into potential energy for the spring,

At IWC, the automatic system is inseparably linked with Albert Pellaton, he was appointed Technical Director to the Schaffhausen-based company in 1944 and made the development of an efficient automatic winding system his top priority. From a design point of view, the difficulty lay in converting the rotor’s bidirectional movements into a unidirectional winding motion that would put the mainspring under tension. Most systems back then either diverted the rotor’s movements to a complicated transmission or used only rotations in only one direction to wind the movement. This resulted in considerable power and energy loss.

Pellaton hit upon a surprising solution, instead of putting a ball bearing or cog at the centre of the rotor, he used a heart-shaped, eccentrically bearing-mounted disc. The latter converts the rotor’s revolutions into the to-and-fro movements of a rocking bar. The bar’s rocking movements are then transmitted to the winding wheel by two pawls: while one of them pulls the wheel (i.e. winds it), the other glides smoothly over the top of it until the roles are reversed. The mechanism patented in 1950 is unusually efficient. The rotor’s smallest movement in either direction is used to wind the mainspring

OUR THOUGHTS

The IWC that we have in store represents a blend of classic design, mechanical innovation, and superior craftsmanship. It stands as a testament to IWC's ability to innovate while honouring traditional watchmaking values, making it a prized piece for aficionados and a reliable timekeeper and great wear on the wrist.