MARCUS & CO.: AN ART NOUVEAU OPAL, SAPPHIRE, ENAMEL, AND DIAMOND PENDANT WATCH AND CHAIN, CIRCA 1906
Set with a pear-shape opal cabochon, framed by the old European-cut diamonds and calibre-cut sapphires, with enamel dial, and enclosing a C.H. Meylan 18-jewel movement, and suspended from a conforming chain with enamel links, signed Marcus & Co. on the watch case and movement, M&CO. for Marcus & Co. on the clasp, the pendant length 2 1/4 in., the chain 20 in.
Footnotes:
Provenance: According to family history, the necklace was purchased by William John Curtis (1854-1927), a prominent New York lawyer and the first president of US Steel Company, for his wife Angeline. It has descended within the family to the consignor.

Please note a sketch of this necklace is in Volume 8 of the Jewelry Design Books of Jaques and Marcus, 1890 to 1910, in the Dartmouth Digital Archive.

Jaques and Marcus (Firm), creator. 'Miscellaneous.' Jewelry Design Books of Jaques and Marcus, 1890 to 1910, 1890. Digital by Dartmouth Library, doi.org/10.1349/ddlp.1950.