I vote for Roberta Vasquez, who was in the first (and only) issue I ever owned (bought it off an older kid when I was 8, 1984).
What is Roberta up to nowadays? I would like to see some recent pics of her. BTW, Petra Verkaik was the Playmate in the last issue of the decade of the 80s---December, 1989. After that began the downfall of Playboy with its obsession with implants and Playmates who looked like they all had identical factory stamped artificial looking bodies.