Swiss gold Art Deco watch with enamelling techniques Circa 1930

Gold dress watch by Baume & Mercier
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A Swiss 18 carat gold and enamel open faced Art Deco lever dress watch, circa 1930.
Rhodium-plated movement, going barrel, straight-line lever escapement, keyless winding, cut compensated balance, blued steel hairspring with a terminal curve.
White enamel dial with radial Roman hours, outer minutes track and gold Breguet hands. The case back with black champlevé enamel, a decor of arabesques in ramolayé-technique, flowers in polychrome champlevé enamel imitating cloisonné work, green flinqué enamel (translucent enamel over guilloché) probably by L. Mayland, Geneva. Dial, case and movement signed. Accompanied by a fitted box.
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Diameter: 45.5 mm
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Signed: Baume & Mercier
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Multiple enamelling techniques
It is extremely rare to find a watch of this era with a case decorated with multiple enamelling techniques (champlevé, ramolayé, cloisonné work imitation, flinqué, painting on enamel and fondant). 
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Baume & Mercier
In 1918, under the direction of William Baume, the Baume Frères company merged with the Geneva watchmaker Paul Mercier, son of a tsarist officer. Since 1921 the company has been called Baume & Mercier fabrication Genève. In 1945 watch production was relocated to La Côte-aux-Fées. After Piaget took over most of the shares in 1965, production was partly relocated to the USA. Baume & Mercier launched the thinnest automatic wristwatch with a date display three years later. From 1970 Baume & Mercier increasingly relied on tuning forks and quartz wristwatches. The company has been owned 60% by Cartier since 1988 and now, like Cartier, belongs to the Richemont group.