A lady's 19th century open faced key-wind fob watch

A lady's 19th century open faced key-wind fob watch, centred with a scalloped guilloche pattern and with black Roman numerals. The reverse with blue enamel Chinoiserie scene within foliate scroll borders. 3.5cm wide. With fine link chain and watch key incorporating a chalcedony matrix seal carved with a boar's head issuing from a Ducal coronet.