Found this on the web and watched a bit of it. Game 3 of the 1957 WS, Yankees-Braves. (Looks like a kinescope.)
Far less time between pitches. Hitters had a backdrop of a chain-link fence with trees behind it. On strikes, the PU's arm is up before the pitch hits the mitt. The players seem to swing differently, too, possibly because pitches "at the letters" were strikes in those days. Batters got in the box and stayed there.
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