Limited Edition of 250 Pieces.   Graham Watch Chronofighter Vintage Pulsometer Limited Edition 2CVCS.B20A.BLACK STRAP. Graham Watches, known as the father of the chronograph, George Graham was also the brains behind inventions such as the dead beat cylinder escapement, the first wall chronograph and the mercury pendulum. Perpetuating this spirit of remarkable innovations and technical expertise, Graham is now a contemporary watch brand dedicated to enthusiasts of the mechanical arts. Graham watches evoke a powerful fascination among connoisseurs with technically and aesthetically playful objects that combine originality, exclusivity and avantgarde. Based on inventive concepts determining design, functions and finish, the British brand made creates imposing wrist machines.