Lot 13
  • 13

A. H. Potter, Boston

15,000 - 20,000 USD
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  • diameter 54 mm
• gilt lever movement, 9 jewels, one minute tourbillon carriage with inclined bi-metallic compensation balance, blued steel Breguet hairspring, glazed cuvette • white enamel dial, Roman numerals, subsidiary seconds • engine-turned case • dial and movement signed, barrel bridge inscribed Reed's Patent Nov. 24 1857.


Time Museum Inventory No. 2291
Sotheby's New York, Masterpieces from the Time Museum, Part Four, October 13th and 14th, 2004, lot 710


Randall, A., The Time Museum Catalogue of Chronometers, catalogue number 135, pp. 282-4.


This highly innovative tourbillon is thought to have been an experimental piece by Albert Potter and according to Anthony Randall, the Time Museum Catalogue of Chronometers it is likely that this piece was never intended for sale. In later case, the case stamped with makers mark C.L.T. The dial with hairlines. It is in running order at time of cataloguing.
"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."

Catalogue Note

The present watch features a standard movement of the Howard Watch Company which was fitted with a one minute tourbillon by A. H. Potter. This example displays Potter's original solution to the problem of changes in frictional dissipation by having the plane of the balance inclined 25% to the plane of the tourbillon.

For another tourbillon watch with inclined balance, see R. Walter Prendel, 'An Interesting Tourbillon,' in the NAWCC Bulletin, 3 (1949), pp. 636-637.