these usually appear holed, but I qas able to find one intatct. It probably has the date visible, but I couldnt find a match. 0,3g and 15mm. Any help is welcome!
Your coin has the ascension year of "120x" visible, and the only monarch whose ascension fits that date is Selim III. Regnal year appears to be 1, so it's from AH 1203 (1789).