1936 Feldenheimer.....powered by Omega's first center second hand movement, calibre 23.4sc, introduced in 1935. Early Omega models using this movement include the Naiad, Medicus, Chantilly, Sainte-Christophe and the Monaco. Only the Monaco was available with a gold case. The others used Staybrite cases. A.C. Feldenheimer was a high end jeweler in the U.S. Pacific Northwest.