French 18k Gold Open-Faced Pocket Watch

French 18k Gold Open-Faced Pocket Watch
Maker: Unknown
Date: Late 19th century
Movement: Cylinder, gilt finished, crown-wound and pusher-set
Dial: White enamel, outer Arabic and gilt dot minute track, Roman numerals, inset subsidiary seconds dial, gilt hands
Case: 18k gold (bears French horse head mark), floral/shield engraved case-back, numbered '52581'
Size: 44mm
Gross weight: 66g
Accompaniments: Unassociated later Zenith wristwatch box