Tavannes Cronometro Escasany 18kt Gold Pulse Timing Watch

Tavannes Cronometro Escasany 18kt Gold Pulse Timing Watch, Switzerland, enamel dial marked "Gradue Pour 30 Pulsations, Cronometro Escasany, Suisse," with subsidiary seconds and elapsed minutes dials, outer beats per minute ring with sweep center indicator, stem-wind, stem-set, movement with chronometer hand activated by crown-mounted button, in an 18kt gold open-face case, dia. 49 mm, 82g.