According to Jeff Kingston, in his superb article ( Lettres du Brassus Nr 3 ), " Rayville was a name used by J.J FIECHTER for some of the Blancpain production."
Well, I own this one for almost one year, now, but I wanted to take my time to make a review on such a great watch.
I hope that this will contribute to make you more curious about these fantastic Vintage FFs, my friend.
There's a lot to learn, and to discover about them!
Best,
Nicolas