I inherited this Favre Leuba Reverso from my uncle. What intrigues me is its Staybrite case. I've never seen one like this before (although a bit similar to the Cartier Tank Reverso). As you may know, the history of Favre Leuba - JLC is very intricate , I would really like to know whether this unnamed movement is a JLC one. In the 1930s Favre Leuba was a distributor of the original Reverso in colonial India.
Any information will be greatly appreciated.