I have discovered that this cocktail glass with its inbuilt cherry (an actual blob of red glass) is a Manhattan glass. The foot and the outer layer are white opal glass; the inner layer is non-uranium green glass. It's obviously handmade, though it has no pontil mark, because I have non-identical twins. Does anyone have any idea who made it please? I can't find anything on online apart from totally different glasses with cherries on here.