I don't know these guys so I can't confirm that they are natural or not but this is how most serious lifting natural guys looked back in the 60's/70's and never had any idea about competing in a BB contest. Back then these guys would compete in endurance events or various pull up or bench press contests that were held in various beach cities up and down the Souther California coast. Winners would receive a small trophy or a couple of free meals in a local hash house and braggen rights.
Most of these beach cit events were won by CP Marines or San Diego sailors who spent a couple of off-hours each day in the base gyms.
If you could bench over 300 pounds back then, you were consider a bench press champion.
But then Pat Casey came along and loaded the bar to 600, benched it - and it's never been the same ever since. That was the day the lion roared. And then sometime around 1963/64, the bulking craze got relatively popular - and bodybuilding took a drastic detour.
Good detour or bad - it's all in the eyes of the beholder.