Also, the motion has a serial variety but It is far from preceded by a "D" as are all the chrono movements I've observed and what may very well be the importance of your initials "ROW" stamped on the plate? It is a tradition of innovation that reinvents itself everyday. https://billr368yac4.blogsvila.com/35033152/the-smart-trick-of-tudor-that-nobody-is-discussing