Dearest Gentleman ; please excuse me if I am not so fluent in the French language :
Apparently, Mathey is a very common Swiss name and Locle was one of the centers of watchmaking in Switzerland. Jules Mathey could have been either a watchmaker or a jeweler who sold watches. I can tell you my watch has the "classic" bar movement layout & dates around 1860s. Also, there is another Jules Mathey watch on display at the National Watch & Clock Collectors Museum in Columbia.
It is a real pleasure for me, Dearest Gentleman, to give you such information ; please feel free to ask more questions !
I am so proud to be able to help you !