There's a date that appears to be AH 1222 (bottom of second photo, could also possibly be 1322 - can't tell from the photo) which would correspond to 1807 AD (or 1904 AD). There's also a number 78 on it (top of second photo). I don't think this is a genuine coin. I believe it's a copy of an Ottoman coin designed to be worn as jewelry, for example in a belly dancer's costume.
This is a "belly dancers' costume" imitation Ottoman coin.
The tip off is the regnal year, 78.
Neither Mahmud nor any other sultan has ruled this long.
many variations exist
Non est totum quod splendet ut aurum
Rijkdom bestaat niet uit het hebben van veel bezittingen, maar in het hebben van weinig behoeften