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

PSA Certification Verification

#71908125

ITEM INFORMATION

Certification Number71908125
Label Type with fugitive ink technology
Reverse Cert Number/BarcodeYes
Year1991
BrandPRO SET PLATINUM
SportFOOTBALL CARDS
Card Number33
PlayerBARRY SANDERS
Variety/Pedigree
GradeMINT 9