I have one of these too -sized about 25mm & 7.0g. I don't think it has ever been determined what exactly it is - there have been threads about it on the Treasurenet site since others have been found metal detecting. http://www.treasurenet.com/forums/what/223493-islamic-coin.html http://www.treasurenet.com/forums/what/132878-token-coin-something-else.html