MB&F

• 3-dimension manual winding horological engine, 50 jewels, twin barrel • two engine-form pods with dials placing at the end for hour, minute and power reserve indication • 18k yellow gold and titanium aerodynamic case, sapphire crystal revealing movement from both the top and bottom, crown on the left for winding and the other for time-setting, bottom of case engraved 'piece unique' • case and movement signed • with an 18k yellow gold and titanium MB&F double folding buckle

Manual winding movement in working order when cataloging. Case with no visible blemishes, buckle with very light wear. Overall in excellent condition. Case numbered 400Y0001. This piece is one of a kind and worthy of collection. Please note that the movement has not been tested for the accuracy of time keeping and a service might be required at the buyer's expense. **Please note that the successful buyer of this lot will receive a complimentary service for this watch within six months after purchase and an one-year warranty from MB&F, including shipping fee of the watch to the MB&F atelier in Switzerland.
"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."

With a MB&F warranty booklet, instruction manual and presentation box.

Originality and singularity in the real world demands great courage, and for that MB&F is willing to devote all into the creation of mechanic wonders. MB&F stands for Maximillian Büsser & Friends, representing the ideal to gather the talents of various artists and watchmakers, the brand sets out on its mission to create unconventional and original horological masterpieces. Launched in 2010, Horological Machine No 4 Thunderbolt (HM4) was regarded as one of the most visually spectacular and ingenious wristwatches the watch world has ever seen. With its futuristic appearance, one would imagine the HM4 was created straight out of a science fiction but in reality, it was inspired by paintings of WWII aircrafts. The aerodynamic case and turbine-like pods bear much resemblance to the sleek form and engines of a military plane. Fitted with a three-dimensional horological engine which consists of 311 parts and a horizontal twin mainspring barrel, it took the brand 3 years to develop this technical marvel. In spite of the complex nature of the movement, the functionality of the HM4 is rather practical with separated indication of time and power reserve in individual dials.

The rarity of this particular timepiece lies not only on its unique design, but on the fact that it is truly one-of-a-kind. It is by far the only known example made in yellow gold and hence the ‘piece unique’ engraved on the watch. According to research, unique pieces from MB&F come in such an exiguity, making this work all the more precious and exceptional.