Revisiting my OP, it has just been my observation that colourful (natural) toning does not appear as common in early milled silver (or hammered for that matter), compared to later milled. I have a colourful toned Anne shilling, but I can barely remember seeing examples for Charles II and James II, while it seems commonplace for Viccy and Eddie 7, and less so for Georges 5 and 6. Am I right, and is there a chemical reason for this? Happily this post has resulted in some collectors posting pics of their toned early milled silver, bring it on, love it! Would be happy is this thread was renamed 'Let's see your toned early milled silver'! (Admins, not seriously!)