A very rare mahogany long duration wall regulator, Urbain Jarossay, Paris

6¼-inch enamel dial signed Jarossay & Cie A Paris, with centre seconds enclosing a subsidiary hours and minutes dial, the movement with pin wheel escapement, three wheel train with helical gearing, the drive provided by two large spring barrels mounted on a pivoted assembly, similarly signed, mounted below the movement and driving a large diameter pulley wheel connected to the movement by an endless cord, the l;arge pulley wheel revolving one quarter of a turn in every twenty-four hours, the separately suspended pendulum with compensation rod mounted to the right with two fine adjustment screws ad raising and lowering the pendulum by means of two levers, beat adjustment on the crutch, the whole mounted on a polished black marble back board with signed beat plaque at the base, contained within a richly coloured case with moulded cresting, glazed door and under-curved base

Dial has two hair cracks from the centre of the hours/minutes dial through VI and VII to the edge. Movement appears to be in good original and clean condition, minor rust spots to the pendulum rod. Some cracks to the marble back board.Case in generally good condition with a few old marks and scuffs and lacking the base finial. With a winder and case key.
"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."

Urbain Jarossay in 1844 applied for a patent to cover his endless-screw gearing and in 1850 applied for a patent to cover an improved version which could be used in clocks.  For each revolution of the large pulley the clock will run for four days, the spring barrels revolve once for every six turns of the large pulley producing a run of twenty-four days. Assuming that the large spring barrels will revolve at least eight times on one winding, the regulator will run for six months.