Gene Walter played for the Mets between 1987 and 1988. Wally Backman's last year with the Mets was 1988. Greg Pavlick was coaching in the minor league system as a pitching instructor in 1987 before returning to the majors with the Mets in 1988.
That would point to this ball being from 1988 assuming the signatures were all gathered in the same season.
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