Not sure, I'll check the Arnold Encyclopedia if any photos from the same photoshoot are there. It's definitely around that time, probably a few weeks or a month out from the Olympia.
In his prime, I still think Arnold had the best overall quad/calf combo of his generation. Never understood why he never got more props for his insane quad development and separation. Maybe it's because his chest and bis were so beyond his peers or maybe legs just didn't count as much.