An early 20th century gem set gold and enamel insect watch pendant

An early 20th century gem set gold and enamel insect watch pendant, realistically formed, the hinged folding wings set with graduated circular cut diamonds on light blue guilloche enamel ground. With black enamel decoration to the head and set with a circular cut diamond and ruby eye. Stem wind movement, white circular dial with blue Arabic numerals and red '12'. 4.5cm long. With a gold fine link chain mounted with blue guilloche and white enamel cylinder links. The chain 56cm.