He personally sent covers to RAF and other World War 2 participants to be signed and so are possibly unique.
Letter from Canada from unknown World war 2 Pilot who flew with Basil Embrey
1856 letter from John Barrow Principal St Edmund Hall Oxford
Geraldine McEwan - Hand Signed Photo + Hand Written Letter From Husband
1994 Letter from Don Snider DFC 408 Goose Sqn + booklet RAF WW2
Genuine typed and hand signed Phantom of the Opera letter from Michael Crawford.
Dambusters Raids RAF WWII letter from Barnes Wallis 1941 Historic Document