A green onyx and glass mantle clock, late 19th to early 20th century, of elegant and restrained architectural styling, having an extended onyx cornice above a fully glazed cabinet enclosing a white metal dial with Roman numerals set within a decorative gilt cast bezel, with a mercury filled pendulum, and upon a stepped onyx base with low bracket feet; with key. Height 37 cm. Width 22 cm. Depth 15 cm