According to the PSA database, the requested certification number is defined as the following:

PSA Certification Verification

#71908155

ITEM INFORMATION

Certification Number71908155
Label Type with fugitive ink technology
Reverse Cert Number/BarcodeYes
Year1991
BrandUPPER DECK HEROES NOLAN RYAN
SportBASEBALL CARDS
Card Number16
PlayerNOLAN RYAN
Variety/Pedigree1990-THE SIXTH!
GradeMINT 9