An Art Deco onyx clock with bird motifs, circa 1920s, with maker's mark S. Marti to mechanism, mark of a. Billie to dial, the multi-toned onyx clock with an arching central plinth housing the square dial with Arabic numerals and flanked by a pair of white metal birds backed with semi circular onyx panels, raised on a stepped rectangular base, with conical metal feet; key and pendulum, height 26.5 cm, width 36 cm, depth 13 cm