This is a #17 batting practice jersey. This style was used from 1997 through 2000 and during this period #17 was worn by either Joe Oliver (1999),
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Official New Era Pittsburgh Pirates MLB 21 Batting Practice
Pittsburgh Pirates Baseball Jerseys, Pirates Jerseys, Authentic
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Pittsburgh Pirates Baseball Jerseys, Pirates Jerseys, Authentic
How do baseball teams in MLB choose which uniforms to wear to what
Baseball Jersey Pittsburgh Pirates #17
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