Hi Dave,
I have Hikoki Publications' edition of 'Wings of the Weird and Wonderful' and the chapter concerning the Sea Hawk has a few photos of 804 Sqdn aircraft. Give me till Thursday and I'll see if I can scan them for you, or at least tell you what they appear to show. One thing is immediately evident - in these photos, the tiger head is further aft than the one on his 'retirement' aircraft. It's approximately where the 171 is painted on the retirement plane, below the rear canopy fairing.
Also, the tiger's head might well be the
other one you have - the ones in the book are the same as the one in the retirement photo, and are slightly different to the one on your screenshots.
As for carrier letter, well, one photo shows what is either a C or the top half on an S on the fin above the tail plane. Would either C or S correspond with a carrier that 804 embarked upon ? HMS Hermes, was it ?
I'm wondering if the 'retirement' aircraft was the HMS Fulmar / Lossiemouth gate guardian, and had been repainted with a degree of artistic license i.e. the tiger head further towards the nose so that they could paint 171 ( Eric's aircraft ) on it just for the occasion.
I'll get back to you on Thursday when I have a day off.
EDIT: Just to confuse you further, this one at East Fortune has A on its tail:
http://www.nms.ac.uk/national-museum-of ... /sea-hawk/
This says that the East Fortune aircraft served with 736 Squadron, and became an instructional airframe at Lossiemouth. I'm sure it must be the one in the retirement photo, and was painted up as Eric's 804 aircraft just for the occasion:
http://www.thunder-and-lightnings.co.uk ... .php?id=63