Geneva, Nov 06, 2021

LOT 130

PATEK PHILLIPE, 18K GOLD MINUTE REPEATER HUNTING CASE WITH GUILLAUME BALANCE

CHF 15,000 - 25,000

HKD 128,000 - 212,000 / USD 16,300 - 27,100 / EUR 14,000 - 23,300

Sold: CHF 37,500

Very fine and rare, minute-repeating, 18K yellow gold, keyless, hunting cased pocket watch.


LOADING IMAGES
Click to full view Click to full view
Image Image

Grading System
Grade: AAA

Excellent

Case: 2-8

Very good

Slightly scratched

Movement: 2*

Very good

Overhaul recommended, at buyer's expense

Dial: 2-19-01

Very good

Dent(s)

HANDS Original

Brand Patek Philippe

Year made in 1913, sold on January 27, 1919

Movement No. 174146

Case No. 401696

Caliber 19’’’, rhodium-plated, fausses cotes decoration, 27 jewels, wolf’s tooth winding, counterpoised and calibrated straight-line calibrated lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, swanneck micrometer regulator, repeating on gongs activated by a slide on the band

Dimensions 52 mm

Signature Dial, case and movement

Notes

The Guillaume Balance. Anibal acier au nickel pour balanciers, an alloy invented by Dr. Charles Edouard Guillaume, exhibits unusual properties, both in terms of thermal expansion and in changes in elasticity. Around 1900 Guillaume attempted to eliminate the so-called Middle Temperature Error caused by the fact that the change of rate in a timekeeper with a steel-brass bimetallic balance is approximately a linear function of temperature, while the change of rate caused by change in elasticity of a balance spring is approximately a quadratic function. Thus, it equals zero at only two temperatures, causing secondary error. In 1899, Guillaume noted that steel with an addition of 44.4% nickel had a negative square coefficient of thermal expansion. 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.