Those designate the size, uniform #, and date/type of uniform. Grey knit jersey with navy and orange. New Era size 7 1/2 cap with Young's # 21
2012 Delmon Young, Detroit Tigers, 1976 Throwback Game Worn Full Uniform, Mears
OT: The sky is fallin' in Philthadelphia - BallparkGuys
Baltimore Orioles - Audio & Video Clips
Detroit Tigers - Wikipedia
2012 Detroit Tigers Delmon Young #21 Game Issued White Jersey 50 DP38980
2007 Topps
Ultimate Cards and Coins - Search for New and Vintage Sports Cards and Coins - Baseball Cards
1997 Detroit Tigers AJ Sager #49 Game Used Grey Jersey DP15151
October 3, 2014: Delmon Young's pinch hit gives Orioles a playoff boost vs. Detroit – Society for American Baseball Research
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Detroit Tigers - Wikiwand
Major League Baseball Season Recap 2010 - This Day In Baseball
Delmon Young returns to Rays
2012 Delmon Young, Detroit Tigers, 1976 Throwback Game Worn Full Uniform, Mears