A Paris ruby cylinder watch, with very stylish gold asymmetric dial, in a fine slim gold case.
MOVEMENT : Gilded ruby cylinder movement. A few scratches to the gilding, but otherwise in good condition, and running well.
DIAL : An unusual and fine, engine turned gold, asymmetric dial.
A few light marks and scratches, but overall in quite good condition. Blued steel hands.
CASE : Slim, gold case, engine turned to the back, bezel and band. French gold marks on the stem and inside of the back cover. The curvette is signed.
A little even wear to the engine turning, wear to the bow and a few light dents and scratches to the inside of the back cover, but overall in good condition. The crystal is fine, and both bezel and covers close correctly.
Guyerdet senior is listed in Paris between about 1835 and 1845.
The ruby cylinder was used by Abraham Louis Breguet to reduce the friction in cylinder escapements. The cylinder itself is composed of a half tube formed ruby, set into two steel plugs, each with a pivot. This was a very expensive innovation and is rarely found.