I agree - they also did a 'Phantom Mustang', with clear fuselage and internal detail. I built one back in the 1970's.
However, if it's in 1/24th scale, which it could be, just comparing size against the door frame in the background, then the Airfix 1/24th scale kit was released in late 1971, early 1972, at a price of £2.50 !!!