I'm pretty sure it is a still from a film made Arthur Gibson, now sadly no longer with us, and maybe Catalina.org could put you in touch with his 'estate managers'?
It was a 'presentation' on the team and how they worked/practiced. It used to be shown when asked to give talks to schools/WI's /flying clubs etc.
A couple of (scanned) pictures - also copyright Arthur, for the thread and for TimS, the first I think also from the film shoots and the second for amusement.
NB The next mate lurking behind the smoke................
Ray has worked out there will be no need to duck!
Edit: TimS - I may have located the film - PM on its way. If I have it was 1969.