I think you will find that SG list booklets with average perforations whereas individual panes are expected to be perfect well centered examples with perfect perforations all round.

James,
In my view "Gutter Pairs" were a freak of the "investment boom" in modern QEII, basically an interest created by dealers.
I agree that GV or EDVII are more desirable and far harder to find.
i do not recall ever seeing a used item.

Steve, My "interest" in these is due to my collection of ED VII issues overprinted for use in the BPO in Morocco. I agree totally on dates for used.For Morocco only De La Rue and S/H exist, its single mint copies of the S/H printing that I find difficult to identify. Any suggestions on tha...

Does anyone know what the biggest mint multiple known outside of a museum collection is ?

Also does anyone have an "easy" way of establishing which are the De La Rue and Somerset House stamps?
Thanks