Thanks, Colin. I guess, as the most detailed study to-date, I will also be running with Withers as my primary reference, adding North and Spink only as points of interest. Am I correct in thinking that crown N is exclusive to type 30 (I will have the book in the next few days)? I've also read that crown N, with its 'wire-line' band, broke up fairly early on in the type, leaving the majority of crown N coins with fractured/no band? I've looked at as many 'Ns' as possible, and have noticed that the missing bits in the band can sometimes reappear on in the later Withers 30s. Do you think we are seeing clogs, rather than damage, though it may/likely have broke up eventually, but perhaps a bit later? My point re the broken/clogged band, is whether you consider it safe to assume that a perfect crown would come from an early part of the reign? Thanks, again!