BRETT FAVRE PROLINE GEM CARD?

any one know about how much a 1990 brett favre proline gem card
is worth.it has a small diamond in the bottom of the card in a pic of
his ring on the card.cant find it online or in a price guide book any
place.
my bad its a 1997 its numer 732 of 1,997 and
its in color the card number is cr1

is it the misprint card where his name is wrong? if so it worth alot to the right man! you have to love the game to put a value on cards and their was K-mart selling cards to so little value on the cards!

#10 — Shapes – Diamond Education Buying Guide Series