First release in 72 as far as I know Mark. Don't forget though, even double bill releases had stand-a-lone Quads produced for each film, not every time, but quite often. The Hammers being a good example.
It's Jolly scarce I've seen two of these (inc this one) in all the years I've been at it, though it isn't a film I alway look for, but if it pops up I do take notice. I have a Press-quotes quad also from an early/first release too, as you know Mark, British paper is not easy to get on this film...