Here's the listing of US baseball stamps from Herrick Stamps (
http://www.herrickstamp.com/news_detail.php?ns=17)Scott# Commemorates Year Issued
855 Baseball Centennial 1939
1370 Grandma Moses 1969
1381 Professional Baseball Centennial 1969
2016 Jackie Robinson 1982
2046 Babe Ruth 1983
2089 Jim Thorpe 1984
2097 Roberto Clemente 1984
2417 Lou Gehrig 1989
2619 Olympic Baseball 1992
3083 Mighty Casey at the Bat 1996
3182n First Baseball World Series (1903) 1998
3183g Jim Thorpe 1998
3184a Babe Ruth 1998
3186c Jackie Robinson 1999
3187c Bobby Thomson's Shot Heard Round the World 1999
3187j World Series Rivals (Yankees and Dodgers) 1999
3188n Roger Maris' 61 in 61 1999
3191a New Baseball Records 2000
3402 Baseball (as part of a set of four stamps honoring youth team sports)2000
3408 Sheetlet of 20 "Legends of Baseball" (includes Sc.#s3408a-t as follows) 2000
3408a Jackie Robinson
3408b Eddie Collins
3408c Christy Mathewson
3408d Ty Cobb
3408e George Sisler
3408f Rogers Hornsby
3408g Mickey Cochrane
3408h Babe Ruth
3408i Walter Johnson
3408j Roberto Clemente
3408k Lefty Grove
3408l Tris Speaker
3408m Cy Young
3408n Jimmie Fox
3408o Pie Traynor
3408p Satchell Paige
3408q Honus Wagner
3408r Josh Gibson
3408s Dizzy Dean
3408t Lou Gehrig
Scott #s 3510-9 were issued in a sheet of 20.
3510 Ebbets Field (Brooklyn, NYC) 2001
3511 Tiger Stadium (Detroit) 2001
3512 Crosley Field (Cincinnati) 2001
3513 Yankee Stadium (Bronx, NYC) 2001
3514 Polo Grounds (NYC) 2001
3515 Forbes Field (Pittsburgh) 2001
3516 Fenway Park (Boston) 2001
3517 Comiskey Park (Chicago) 2001
3518 Shibe Park (Philadelphia) 2001
3519 Wrigley Field (Chicago) 2001
In addition to the July 2006 Baseball Sluggers postal cards, there have been some others issued by the U.S. Postal Service. Included is the booklet of 20 (Scott #UX337-56) cards issued in 2000 as a companion to the Legends of Baseball stamps. With a denomination of 20¢ per card, the booklet of 20 cards was sold by the Postal Service at $8.95, or over twice the face value. Scott #s UX365-74 were issued with the Legendary Playing Fields stamps. These had a denomination of 21¢ and sold for $6.95.