An early 19th century pink gold, silver and niello openface keywound pocket watch, by Breguet, with later case

An early 19th century pink gold, silver and niello openface keywound pocket watch, by Breguet, with later case
The circular white enamel dial with Arabic numerals, subsidiary seconds, the gilt-finished mechanical jewelled movement with three arm balance, to a later pink gold case decorated with niello foliate motifs to the case back and band, with an associated 9ct gold watch chain, case 60mm wide
Dial signed Breguet et Fils, cuvette and movement signed Breguet, no. 1640