Original Royal Navy White Ensign Flag Possibly From The HMS Ark Royal

Original Royal Navy White Ensign Flag Possibly From The HMS Ark Royal sold with Vintage Plaque.
Royal Navy ensign reputed to be flown over the HMS Ark Royal in the 1970s. Formerly belonged to lieutenant Commander George Hammerton who served as a Senior Gunnery Officer on board the Ark Royal.  
See attached links:
https://en.wikipedia.org/wiki/HMS_Ark_Royal_(R09)
Flag Measures:-
L148”xH70”
£495
Ref/NP5655