Chingford thanks for the info on the book (£15 from Galata) should be worth checking out. I imagine this may be the book he was thinking off if its the only Crown publication you can think of although I wasn't just interested in proofs. 1887 Jubilee thanks for the link got me measuring the T's to the R's, although I scaled it down to a average of 5 measurements. As for what varieties I think exist I couldn't really say as I'm just looking for more information at the moment. Is it just the 1887 your interested in or all Jubilee heads?