This RED SOX CARL YASTRZEMSKI AUTHENTIC SIGNED 1976 RED SOX CHECK PSA/DNA SLABBED has been certified authentic. The check is written to Yastrzemski in the amount of $588.89 and is signed by John J. Rogers. It is signed by Yastrzemski on the back of the check. It comes slabbed and authenticated by PSA/DNA. You can also see the authentication on the PSA/DNA website, PSAcard.com.