In his book he mentions this as the largest his arms ever got, around 18 which look huge here. Great shape and shoulder width.
I have his book building the Classic Physique & itīs a great read, infact one of the best books iīve read on Natural training.
Itīs amazing how he got in shape for films as he wrote he never trained all year round.
some people say he was on the juice but i donīt believe it looking at his physique.
His incline curls were special in that he fixed a bar onto the incline bench so that when he curled his arms were motionless like using an arm blaster but on an incline, also he used an off set grip.