Research historical records on sites like Heritage Auctions or Goldin to see what similar high-end items fetched in the past.
Counterfeits are common. Professional authentication is the only way to guarantee an item's value and make it "liquid" (easy to sell). buy sell sports memorabilia
Ensure any item you buy comes with a COA from a reputable TPA, not just a random handwritten note. Research historical records on sites like Heritage Auctions
Use clear, well-lit photos showing every angle and any flaws. Transparency builds trust. buy sell sports memorabilia