Authenticating autographed memorabilia to boost resale value

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Authenticating autographed memorabilia to boost resale value - Hall of Fame Card Grading Canada - Toronto Card Grading Company

Should I authenticate with PSA or go for the grade? Trying to sell on his retirement. Have held this card for 20 years lol (since I was a kid) : r/basketballcards

Getting Started in Collecting Autographed Memorabilia