Not bad Ken
and the name I was looking for was Cesar de Trey as I now can see In Absentia has mentioned in his post
Jaeger-le Coultre Reverso
The polo-playing man-about-town of the 1930s was just not properly dressed unless he had a Reverso buckled to his wrist--it was the sports watch of the day. Former denture maker turned horologist (watchmaker) Cesar de Trey was visiting India in 1930 and encountered a large number of polo players, whose cracked watchglasses may well have testified to their sporting prowess, but made telling the time a bit difficult. His solution was to devise a watch that, with a quick flick, could be turned over to reveal a steel back, thus protecting the glass from stray balls and flying polo sticks. This reversible watch also allowed the vain playboy to engrave either his initials or his coat of arms on the back, turning the watch, in effect, into a testosterone-charged signet ring.