18K yellow gold and enamel manual-winding vertical rectangular-shaped reversible gentlemans wristwatch snap-on case-back; white enamel dial with subsidiary seconds at 6. Case-back polychrome enamelled with a scene inspired by the "Crépuscule" (dusk) of Alphonse Mucha (1860-1939) Czech Art Nouveau painter and decorative artist known best for his distinct style.