Mets announce Jerry Koosman number retirement date –
Mets pick new date for Jerry Koosman's number retirement ceremony
Mets' next retired numbers prediction
Jerry Koosman Mets Hall of Fame Plaque - Mets History
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Mets to Retire Jerry Koosman's Jersey - The New York Times
Mets announce Jerry Koosman number retirement date
Mets will retire Jerry Koosman's number in 2020 – New York Daily News
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Jerry Koosman to Have Number Retired on August 28, 2021
NY Mets to retire pitcher Jerry Koosman's number next season