Robin Harris (Unitrade Canada specialized editor) has a series of catalogues with deeper specialization for Canadian Elizabethan definitive stamps, and he may well be interested in this info for his Environment Definitive Series catalogue. As an example, his Centennial Definitives catalogue shows 96 plate variety listings for the 6 cent orange, 86 plate variety listings for the 7 cent, 77 plate variety listings for the small 8 cent, etc. This level of detail is only due to some studies that were made of plate proofs in the National Archives, but they do indicate that he's not afraid of publishing flyspeck research.
My copy of his catalogue (1997 second printing) shows 3 different variety listings:
- mole on Queen's jaw (LR stamp in UL blank blk 9)
- "raised eyebrow", dark band over the Queen's eyebrow (pos 1, C2-C3), 1 in 6 panes
- noticeable break in the background shading behind the Queen's head (pos 12, C5), 1 in 6 panes
Here's the link to his page on his specialized catalogues.
http://www.adminware.ca/phil_bk.htmRyan