trim would be your man for these late Roamers. I would say mid Sixties to early Seventies, and my feeling with those hands is more into the the early 1970's, but dating on these is not my speciality at all.
There is quite a lot of similarity of the dial with a watch of mine
Peeking out from underneath the balance of yours is what (as on mine) appears to be an ST calibre. Can't recall if it actually shows a calibre number on these or not but I would assume so. I note too that yours is missing a barrel bridge screw - I'm assuming a watchmaker lost this at some point, which doesn't bode well for the quality of any work undertaken.
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