Omega Speedmaster Professional Black Watch 311.90.42.30.01.001 - Replica Watches

A series of watches whose production run is determined in advance of production and limited to a set number.A series of watches whose production run is determined in advance of production and limited to a set number。Complicated watch with a function for measuring short periods in addition to its function for permanently displaying hours,minutes and seconds.A tachymeter is an instrument for measuring speed.It is a chronograph with a graduated dial on which speed can be read off in kilometres per hour based on 1000 metres distance.A hand on a sub-dial which tracks seconds;typically it completes a full rotation in one minute.