1955 IWC Automatic Pellaton 1390171


1955 IWC Automatic Pellaton Automatic watch in a 36mm stainless steel case with a clear silver dial. This particular watch has the Pellaton winding system. This system paved the way for IWC.

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,” explains Gäumann.


Even if the principle is simple enough, an automatic winding system poses many different challenges for the design engineers. On the one hand, the mechanism must function perfectly for a wide range of wearers with different habits and lifestyles. On the other, the automatic sub-assembly is exposed to more wear and tear than most other parts in the movement. In the new 52850 calibre, for instance, the rotor has to complete 2600 revolutions to fully wind the two barrels in the Portugieser Annual Calendar. Although the rotor weighs just less than five grams, the forces exerted on the components during rapid movements may be as much as 5000 times that of gravity. Protecting the oscillating system against wear and tear, therefore, merits special attention.


Credit : IWC website


Dial Colour: Silver

Collection: IWC Ref 1390171

Style: Male

Case Material: Stainless Steel

Clasp: Buckle

Strap: Green Leather

Case Size (mm): 36mm

Glass: Plexi

Movement: Automatic C852

Water Resistance: N/A

Features: Centre Seconds

Stock Code: IWC004

The watch comes with a two year guarantee.


In stock

SKU: IWC004 Categories: , Tags: , , , , ,
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