Likely straight OBR in the 60's, wood bats, and no FPSR.
Definitely no FPSR or, for that matter, any prohibition against crashes. I was crashed several times. Once, when the collision (at 1B) prevented me from making a good throw home to get a runner, my coach upbraided me for "letting one of those *******s knock you down."
Hey, the site automatically "asterisked" my word!
The coach used the "b" word, applied to people born out of wedlock.