SWISS, DIAL SIGNED ERNEST DUVAL, GENEVA, CASE STAMPED B.W.C. CO. FOR BROOKLYN WATCH COMPANY, NO. 18086, CIRCA 1890

The watchmaker Ernest Duval was active in Geneva in the late 19th century. According to Swiss Timepiece Makers by Kathleen H. Pritchard, p. D-113, his name was imported by Edmond E. Robert, New York, in the early 20th century.

The combination of a one minute tourbillon and a duplex escapement, more commonly found in watches made for the Chinese market, is highly unusual.