I am trying to give some place and time to this family heirloom (silver watch)

I know it is German and post 18888 (and the crown, crescent and the "0.800" seem to confirm that) ... but is that, unfortunately, is as far as I got.
From a different angle this another hallmark that looks like a pheasant (??), I'd say, but I am not sure where that leaves me.

There is also a "lid" between the clockwork and the back of the watch and that appears to be French/Swiss (??) and say "Montoir" and "Cynlindre" (??) 10 "Rubi", which I guess is the clockwork itself?

Any help, pointers, etc. greatly appreciated.
Martin