Carriage clock, Alarm clock - Brass - 1850-1900

It is an officer’s pendule / travel carriage clock, with original case, key, matted glass, brass case and alarm dial. The type is French and it probably dates to the late 19th century, around 1880–1900.
The important thing about yours is that it seems very complete: it has the lined travel case, the double-ended key, the top glass that lets you see the balance wheel, and the dial with Roman numerals and the small alarm dial. Original case and key are positive elements for the value.