A. Lange & Söhne

• cal. L034.1 three quarter plate German silver key winding movement, 62 jewels, Nivarox balance spring • silvered dial, applied faceted baton indexes, Lancette hands, subsidiary seconds, twin apertures for date, fan form sector for 31 day power reserve indication, outer minute divisions • platinum case, date engaged through pusher to the case band, sapphire crystal display back secured by six screws, key winding mechanism to the case back • case, dial, and movement signed • with a platinum A. Lange & Söhne folding clasp

The movement is running at time of cataloging, however it was not tested for the accuracy of time or duration of the power reserve and may need service at the buyer's discretion. Please note that Sotheby's does not guarantee the future working of the movement. Case in overall very good condition with light wear. Upper lugs with some scuffs and nicks. Bezel with some soft wear. Light and minimal surface marks throughout. Key winding mechanism working properly. Date function working properly. Dial and movement in excellent condition. Associated winding mechanism in excellent condition. ***Please be advised that the bands on this watch are made of materials derived from endangered or otherwise protected species (i.e. alligator and crocodile) and thus not sold with the watch, they are for display purposes only. We will remove these bands prior to international shipping.***
"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."

Accompanied by a facsimile A. Lange & Söhne International Guarantee confirming the date of purchase on January 10th, 2012. Together with one instructional booklet, one polishing cloth, sales tags, one leather bi fold, two winding mechanisms, one winding mechanism case, and a presentation box with outer packaging. 

The Lange 31, which amasses an impressive 31 day power reserve, is further enhanced by the caliber's ability to maintain a consistent rate of accuracy over its entire 744 hours of winding autonomy. A constant force escapement is positioned between two mainspring barrels to deliver a maintained torque level through the power reserve period.