Circa: Manufactured in 1942
Case material: Stainless steel
Diameter: 65 mm.
Dial: White enamel
Movement: Manual, with Guillaume balance
Functions: 36-hours power reserve
With: Two presentation boxes and key
Certificate: No
Box: Yes
Remark: With two original stackable presentation boxes, both engraved movement no. 122'545; according to Ulysse Nardin, the present pocket watch was manufactured in 1942
Note: The presentation box that accompanies this lot may not be the original “fitted box”. Please refer to paragraph A in the Conditions of Sale for further information. If you have any queries, please contact Watch Department at watcheshk@christies.com

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This lot is offered by Christie's Hong Kong Limited

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Lot Essay

The Guillaume Balance
In 1899, Dr. Charles Edouard Guillaume noted that steel with an addition of 44.4% nickel had a negative square coefficient of thermal expansion. The new alloy, called "Anibal" exhibits unusual properties both in terms of thermal expansion and in changes in elasticity. Anibal, combined with brass in bimetallic laminae, makes expansion close to quadratic. Balances with bimetallic rims made of anibal and brass are usually called Guillaume balances after their inventor.