Something rather nice landed in the mailbox today and I am hoping if Glenn is still around, he might be able to shed some more light on it.
I had never seen one before, never really expected to either. As my Philatelic budget is tiny, even if I did see one, I thought it might be out of reach !
Anyway, after a tiny bidding war [see earlier post] I won a very nice item. Shown together with normal, issued sheet.


It looks like a 1940 Centenary Exhibition Souvenir Sheet cut from a Proof sheet of 4. It appears to be the right corner copy. It is, of course, missing the Red Cross Overprints.
In Glenn's [and Graham's] Catalogue, British stamp exhibitions, it is cut from number 40A-10a.
My questions to Glenn are:
Do you know how many Proof sheets exist ?
Am I correct in assuming that the Proof sheet in green would have the same layout as 40A-09a, the Chestnut example which is shown in the catalogue ?
You state in the catalogue that a sheet was sold in 1997. Is this the first time you had knowledge of the existence of the Green Proof Sheet? [There was no mention in the earlier catalogue].
And do you know where the sheet was sold ? [auction; dealer; private]
To me, a nice find especially as I have been unable to add much to my collection recently due to the rising prices of Cinderellas generally, and Exhibition material especially.
Londonbus1...I'll add the regular sheet tomorrow.

P.S. Regular sheet added !