Antique French Art Deco Malachite & Champleve Crystal Regulator Mantle Clock. DESCRIPTION: Art Deco clock set-including one clock proper and two amphora form urns-each piece of which features a malachite coating over onyx on its base, Champleve and gilt bronze trimmings, and four feet. Clock top and bottom and vase bodies are composed of onyx coated in malachite and clock dial is coated in porcelain, accented with floral garlands, and framed with a Champleve border….