AI Appraisal Estimate

This is a formal 'Guarantee of Authenticity' certificate issued by Stacks of Plaques, Inc., specifically for a hand-signed signature by the legendary boxer Muhammad Ali. The document is printed on light blue paper stock and features a decorative dark blue or black border. At the top, it bears a graphic logo 'STACKS OF PLAQUES' depicted under a silhouette line of various athletes including a basketball player, golfer, baseball player, and tennis player. The central text officially congratulates the owner and guarantees that the item purchased features an authentically hand-signed signature of Muhammad Ali. In the bottom right corner, the certificate is signed by Lou Scalia, the President of Stacks of Plaques, Inc. This document serves as a 'Certificate of Authenticity' (COA) which is a crucial provenance element for sports memorabilia. Physically, the item appears to be in a protective plastic sleeve or album page, showing some slight reflective glare but otherwise clean edges and no visible creasing or staining. The typography is a mix of serif and bold sans-serif fonts, characteristic of late 20th-century commercial printing for collectibles. This type of documentation was common in the 1980s and 1990s when Muhammad Ali held numerous signing sessions with organized memorabilia companies.

I have virtually examined the Stacks of Plaques Guarantee of Authenticity for a Muhammad Ali signature. The document, printed on light blue paper with its characteristic athletic logo, appears to be in excellent condition, resting in a protective sleeve without visible foxing or damage to the borders. Stacks of Plaques was a prolific memorabilia dealer in the 1980s and 1990s; consequently, their COAs are well-recognized within the hobby, though they occupy a tier below modern 'big three' authenticators like PSA/DNA, JSA, or Beckett. In the current market, a stand-alone COA functions solely as a provenance accessory. The $40-$60 value reflects its worth to a collector who already possesses the corresponding signed Ali item but has lost the original documentation. This document adds significant 'paper trail' value to a signature, but its value is capped because the market generally requires primary signatures to be re-authenticated by modern forensic standards regardless of the original COA presence. While the typography and Lou Scalia signature appear consistent with known authentic period certificates, a photograph cannot verify paper weight, ink absorption, or the presence of specific security watermarks. Limitations of this remote appraisal include the inability to verify the physiological age of the paper or detect sophisticated reprints. For full authentication, I would recommend an in-person physical inspection to verify the tactile properties of the paper and a cross-reference of the specific sale record if available. Ultimately, this document serves as a historical support piece rather than a primary asset.