28 April 77 Introduction of the Hawk into the Royal Air Force Special Postmark Commemorating the First Training Flight in a Hawker Siddeley Hawk at RAF Valley. Flown in H S Hawk XX167. Personally Signed by Duncan Simpson Hawker Siddeleys Chief Test Pilot who has been closely associated with test flying of the Harrier and Hawk & Gp Capt D L F Thornton OBE Officer Commanding RAF Valley Details enclosed.
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1840 2d BLUE
Mulready's
Rainbow Trials and DPs
1841 Penny Reds
1841 2d BLUE
Penny Stars
2d stars
1/2d Bantam Plates
1d Red Plate Numbers SG 43
1 1/2d Plates SG51
SG45 2d Plates
Embossed Issues SG 54-61
Dollis Hill Wilding Trials
Commems
GB Overprinted
Surface Printed
Other QV
KEVII
KGV
KEVIII
KGVI
QEII
Wildings
Wilding Coils
Machins
Decimal Booklets
Smilers Sheets
Guernsey & Alderney
Jersey
Isle of Man
M/Sheets
Northern Ireland
Scotland
Wales
Officials
Postal History
Telegraph & Fiscals
Circular delivery
Postage Dues
Misc Products
Foreign
Prestige Books
Regionals England
Signed Artwork