A brass and green onyx four glass mantel clock

细节
A brass and green onyx four glass mantel clock
with stepped top and base, the white enamel Roman chapter ring with recessed visible Brocot escapement and spade hands, the twin going barrel movement with mercury jar pendulum and strike on gong, French, last quarter 19th century -- 11¼in.(28.5cm.) high
See Colour Illustration (Plate 10)