In Pumping Iron, Franco was asked to do a Lat Spread. That's what brought on the "Franco The Bat..." comments.

Since he was asked to do it, that leads me to believe that it was a compulsory pose, even back then.

Louie also did one. I think Pumping Iron simply missed it. Perhaps we will see it when it comes out on DVD (whenever that will be. They keep pushing the release date back). There's suppose to be a lost more footage.