1999 SP Signature Autographs Greg Maddux #GM

1999 SP Signature Autographs Greg Maddux #GM value & prices

The 1999 SP Signature Autographs Greg Maddux #GM is a Baseball card released in 1999. Ungraded copies carry a market value of about $240.77.

An ungraded copy is worth around $240.77, a PSA 9 around $283.39, a PSA 10 (Gem Mint) around $1,327.43, a pristine BGS 10 around $1 and726.00. That's roughly a 5.5× premium for a gem-mint copy over raw — one of the clearest signals that condition-sensitive buyers dominate this card's market.

Is it worth grading?

With raw copies near $240.77 and top grades reaching $1,327.43, grading a sharp copy of this card can clearly pay for itself — the spread comfortably covers a typical ~$25.00 grading fee. The catch: only submit copies with strong centering, clean corners, and unmarked surfaces, because anything below a 9 usually erases the math.