An important gentelman's Gold Omega Speedmaster Professional Apollo XI Moon watch no. 688, Limited edition round button chronograph. Made from 1969-1972 to commemorate the Apollo XI mission to the moon. Circular case, brushed gilt dial, bronzed bezel with tachometer graduation. Black enamel markers, registers, and tachometer. Centre sweep seconds. Screw back with enameled inscription 'Omega Speedmaster Apollo XI 1969 The first watch worn on the moon 688.'