C.H. Meylan made or at least signed similar MRs. The example shown below has a usual swan's neck regulator, but Meylan 3/4 plate movement mainly used a cam type regulator as on the watch you are showing, Bryan. I have long thought that J.J. Badollet was the source of C.H. Meylan 3/4 plate movement. So I am putting a buck on Badollet to win, a buck on C.H. Meylan to place, and am acknowledging that the maker likely was someone else.
Bryan, the watch I posted is signed by Meylan. It isn't in my collection, just in my Meylan database, where I have classified it as a Type 8C minute repeater, probably a hunter. I noted that some Meylans likely were made by H.L. Matile and that Matile #10,909 was an open face version of a Type 8C minute repeater. So, perhaps Matile was the maker, or just another customer of someone else's ebauche or finished movement.