I have seen many, many vintage Tissot Seastar's , but never in this configuration. Better pic's would help, but case and dial look like late 60ties dresser type seastar's, bezel is definitely not Tissot's. Dial doesnt seem to fit well and what happened to the date window?
Thanks for the better pic's.
However I still see an ill-fitting dial (incl date window..) Stardust is 'patina' (maybe caused by moist in the past) and ref nr seems to be related to some specific models PR516GL's.