Jerry Koosman Autographed Jersey - Mets History

Honoring Keith Hernandez's No. 17 jersey retirement with 17 stories of the Mets lifer - The Athletic

Jerry Koosman Baseball Stats by Baseball Almanac

Charitybuzz: 1969 Mets World Series Champs Signed Memorabilia

Heroes of '69: Jerry Koosman Lived For The Big Games - Metsmerized Online

Jerry Koosman MLB Original Autographed Items for sale

Memorabilia Ultimate Team Set

Jerry Koosman Autographed Jersey - Mets History

Remembering Mets History (1973) Jerry Koosman Shuts Out the Giants for Ten Innings In a 1-0 Win

Jerry Koosman Trades and Transactions by Baseball Almanac

Jerry Koosman Autographed Jersey - Mets History

This Day in NY Mets History: Jerry Koosman makes his MLB debut against the Phillies

Jerry Koosman Archives - Page 2 of 3 - Mets History

Sold at Auction: 1969 Mets 16x20 Photo Signed By (16) With Jerry Koosman, Bud Harrelson, Ed Kranepool (JPRS Hologram)

Mets COTW: 1979 Topps Jerry Koosman – Mets360

1969 New York Mets team autographed baseball bat