Claim: The Jamestown Expos played in the New York–Penn League and the Pennsylvania–Ontario–New York League, and their mascot was Yippee from 1983 to 1988.
Evidence: The team existed under various names from 1939 through 1993 and played in the New York–Penn League and its predecessor, the Pennsylvania–Ontario–New York League. Yuppi (1989-1993)
Yippee (1983-1988) 
New York–Penn League (1957–1993) Pennsylvania–Ontario–New York League  (1939–1956) Yuppi (1989-1993)
Yippee (1983-1988)