Interesting about the size. I'd presumed it was a shilling as it's considerably bigger than any of the Elizabeth 6ds I've got, both genuine and potentially fake. But it's true that the coin I've scanned above is on a reasonably complete flan while some of the definite 6ds have bits missing round the edge. To avoid comparison with clipped coins, I've measured the diameter of the inner circle: on this coin, it's 21.5 mm, while on the supposedly fake 1593 6d it's 18 mm and on a definitely genuine 1565 6d, 17 mm. I realise these are all different issues, but would the 6d die vary so much in its design dimensions, rather than the dimensions of the flan? Weight -- unfortunately I have nothing accurate enough to weigh it. I'm far from convinced about the metal though. It's very friable and brittle (that crack across the middle could split at any time), and it's a brighter, yellower colour than the usual silver grey of 400+-year-old silver in not very good condition. It also makes a completely different noise when tapped.