Only buy signed items certified by PSA/DNA , JSA (James Spence) , or Beckett (BAS) .

Items featuring both Larry Bird and Magic Johnson are uniquely valuable due to their historic rivalry.

Bird has a very consistent, legible signature. If it looks shaky or rushed, it may be a "clubhouse" version signed by an assistant.

His most iconic card (shared with Magic Johnson).

A genuine Bird-signed basketball rarely sells for under $300.

A PSA 10 (Gem Mint) rookie card can be worth six figures, while a PSA 5 is worth a fraction of that.