Very nice indeed.
I only collect the Exhibition stuff in Cinderellas so it was nice to see other pieces, Congress and Postage stamps/sheets.
two questions for now:
What number is on the back of the 1979 Yellow/Orange sheet ?
What colour is the cancel on the reverse of the 1972 BPE [Malta] sheet ?
This is the first time I have seen one or two items, most notably the 1963 [or 1964] Kennedy sheet. A nice story surrounding that one.
I always find it strange that some very cheap items are hardly ever seen....same with postage stamps too !
Thanks for showing such great stuff.
The name P.L. Jackson is familiar...must check some magazines.

Londonbus1