• quartz movement with five power storage batteries and electrical transistors • black matte dial, inner sunken dial with Arabic numerals, outer ring calibrated for Arabic 60 seconds • massive cast iron patented waterproof housing, raised bezel, electrical plug and adjustment nobs for adjustment, secured by 10 hexagonal screws • dial and housing signed, movement numbered

The movement is not running at the present time. The rechargeable batteries might need to be changed before it would run without a power source. The movement is numbered 1644. The dial is clean and shows no marks. The patented cast-iron housing is in nice condition with no major marks to it. Overall this is an interesting and unusual clock in very nice condition.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. All dimensions in catalogue descriptions are approximate. Condition reports may not specify mechanical replacements or imperfections to the movement, case, dial, pendulum, separate base(s) or dome. Watches in water-resistant cases have been opened to examine movements but no warranties are made that the watches are currently water-resistant. Please note that we do not guarantee the authenticity of any individual component parts, such as wheels, hands, crowns, crystals, screws, bracelets and leather bands, since subsequent repairs and restoration work may have resulted in the replacement of original parts. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue. In particular, please note it is the purchaser's responsibility to comply with any applicable import and export matters, particularly in relation to lots incorporating materials from endangered species.NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

**Please be advised that bands made of materials derived from endangered or otherwise protected species (i.e. alligator and crocodile) are not sold with the watches and are for display purposes only. We reserve the right to remove these bands prior to shipping.

Important Notice regarding importation into the United States of Rolex watches
Sotheby's cannot arrange for the delivery of Rolex watches to the United States because U.S. laws restricts the import of Rolex watches. The buyer or a designated agent may collect the property in the country of sale."

Accompanied by Patek Philippe fitted presentation case with electric plug, numbered Instructions pour L'emploi du Chronotome 'CC', Patek Philippe Electronic Diꦿvision technical booklet and repair correspondence between the original purchaser and the Henri Stern Watch Agency.

In 1952, Patek P♚hilippe developed the first miniature electronic timepiece using a quartz crystal and transistors, making it the first clock without moving parts or contacts to the movement.

This new technology allowed for an extremely efficient and dependable movement that would 𒉰only gain or lose a small fraction of a second every day. This was the result of Patek Philippe's new Electronic Division that focused especially on marine chronometers and industrial master clock systems.

The pre🌌sent model, the Chronotome, was developed in 1958 and stood apart from other clocks as it had the ability to store and use energy with the inclusion of five rechargeable batteries. Such a device would be helpful when the clock was used away from an immediate source of power. In addition, this model is housed in a patented cast-iron insulated box that would protect the quartz crystal and transistors from varying temperatures.

This model, the Chronotome CC, was accurate to plus or minus 0.02 seconds a day. According to the accompanying technical booklet, '... Patek Philippe [has] set a production goal in🀅 chronometers and master clocks that will satisfy, technically and e൲conomically, the most demanding clients.'