Possible Charles II Of Spain Gold Or Gilded Coin To Identify Please

I've just been shown this coin by a friend. I didn't have my good camera with me: the photos are the best I could manage.

This piece has been in his family for years and he thinks it's gold. It's about 36mm in diameter and feels slightly too light for a gold coin to me. I wonder if it's a silver coin that has been gilded? It's a hammered coin but is much thicker than typical English hammered coins and the one silver hammered Spanish coin that I own: it is almost as thick as a US silver dollar. The edges are fairly smooth and worn with no sign of mould marks. A loop has been soldered onto the coin. There appears to be a date (16xx) under the portrait on the obverse. I've looked at photos of Charles II coins and none seems to match this. I suspect it may be a fantasy piece made for jewellery, but I'd be happy to have other forum members' views. My friend also inherited some quite nice British Victorian silver coins that are definitely genuine and a 1903 British Trade dollar - this was with them, wrapped in tissue paper in a polythene bag!




Thanks everyone for looking at this - it's outside my usual field of knowledge!