Well, Dave... I don't suppose this is any help at all, but: Currency to the left, Maundy to the right. I suspect the lighting of the two photos is so different because the poor camera was trying to make sense of the "proof-iness" of the Maundy, so squeezed down the aperture a bit. It's the same blue background in both shots (Groom's bronze book!). The Maundy is very mirror-like in the hand. Doesn't quite look like a proper coin, unlike the currency, which just looks like any other high grade silver coin. If you laid out all the Jubilee Head threepences I've got, the Maundy would stick out like a sore thumb.