No guys, its definitely a 65. Maybe the grip Ian gave me to try is for an 80?
You should be able to see easily in the cutout - the mod 80 has a short strap(?) with a rounded base that the grips screw into, whereas the 65 one is nearer the length of a traditional grip
Vintage Airguns Gallery
..Above link posted with permission from Gareth W-B In British slang an anorak is a person who has a very strong interest in niche subjects.