Courvoisier Frère Mobilis Rare Tourbillon after Swiss Patent No. 30754 by Paul Loichot.

Rare Tourbillon Mobilis pocket watch with silver case by Courvoisier Freres manufacture, Switzerland circa 1910.

Lepine case in 900 silver with corresponding Swiss hallmark, case no. 853. Back cover guilloché with small cartouche in the center. Case is in excellent condition.

Slightly domed glass in nice condition. Small off-center silvered brass dial with Arabic numerals in very nice condition. Two blued steel spade hands. The visible plate is guilloché and gilded.

In the lower half, the tourbillon movement is visible. This is held by a silver bridge with central jewel. Movement with piston-tooth lever escapement, fine regulation, bimetallic compensation balance, crown winding and steel escapement wheel. Flat blued steel hairspring, back of the movement with visible winding and ratchet wheel. Movement with Swiss cross and Mobilis mark as well as number 10957 and patent no.30754. Movement is gold and silver plated.

Diameter approx. 53mm, weight 98 grams. The pictured watch case is part of the offer.

Overall condition very nice. The clean movement runs perfectly. All lids close well. A very rare, collectible piece in near mint condition.

The brothers Henri-Louis and Philippe Auguste operated under the name "Courvoisier Frères" from 1842. In 1882, the name changed to "Courvoisier Fils" when more brothers joined the partnership. Specializing in high quality watches, they were commissioned by the city of La Chaux-de-Fonds to build a watch for Prussian King Frederick William IV; this is said to have been the flattest watch in the world at the time. The tourbillon movement invented by the Swiss Paul Loichot, which he turned inside the case to make it visible on the dial side (Swiss patent no. 30754), was registered by the Courvoisier brothers under the trade name "Mobilis" on July 4, 1905 with the patent number 19062.

Literature reference: The pocket watch collection of Gerd Ahrens, Volume I, page 309

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