AVi-8 Watch Dual Retrograde Chronograph AV-4056-06. In the annals of aviation history, perhaps no fighter plane stirred as much controversy, excitement and technological wonder as the Hawker Harrier Jump Jet, which flew for the Royal Air Force and for the US Air Force during the latter part of the 20th century. This incredible aircraft, powered by the famed Rolls Royce Pegasus series of engines provides the aesthetic backdrop for Hawker Harrier II Dual Retrograde Chronograph timepieces.