A travelling clock by Cartier

A travelling clock by Cartier, the square chapter ring with blue enamel Roman numerals, plain white dial signed 'Cartier' with steeled hands and seconds hand, a blue enamel torpedo motif with yellow caps applied above and below, cabochon sapphire winder, hinged cover, the reverse signed Cartier in script and numbered 890908582, quartz movement, 6.3cm longest