Answered January 12th, 2020

Babe Ruth had an on-base percentage of .532 when slugging .700 or better and making 502+ plate appearances in 1920.

.450 obp,.700 slg by a player in a season before 2017, minimum 502 pa
Interpreted as:
.450 or higher obp,.700 or higher slg by a player in a season before 2017, minimum 502 pa

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