Did Arnold get calf implants?

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If you see Arnold's pics from the late 1960s you see that his calves are "barely there".

Then all of a sudden he gets monstrous calves around 1969-70.

I have never seen "in-between" pictures where his calves were intermediate.

I remember reading somewhere that Weider paid for Arnold's calf implants (probably a rumor)

This site doesn't allow me to post pictures so you'll have to look them up yourself

What do you guys think?