Ask the Experts in Sports Memorabilia Appraisals

USPAP-Certified Appraisal Services

Professional Appraisals for Insurance, Estate, Donations & More

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Interested InEstate PlanningInsurance CoverageCharitable DonationsMarket Value AssessmentOther

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Ruth

$1,062,720

39 Bids

38 BIDS

Gretzky

$1,656,162

50 BIDS

Jordan

$420,000

17 Bids

PSA/DNA 9

$357,594

17 Bids

Namath

$118,230

26 Bids

Wilt

$393,354

24 Bids

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Why Appraise Your Sports Memorabilia Collection?

Whether you’ve spent decades building a world-class sports memorabilia collection or inherited a few prized pieces, a formal USPAP-compliant appraisal ensures your assets are protected, valued correctly, and preserved for future generations. An official appraisal serves a range of critical purposes:

Estate Planning: Leave a clear, accurate valuation of your collection for your family and beneficiaries.

Insurance Coverage: Make sure your collection is properly insured against fire, flood, theft, or accidental damage.

Charitable Donations (IRS Non-Cash Tax Deduction): Required by the IRS for donations exceeding $5,000.

Equitable Division (Divorce, Partnership Dissolution): Third-party valuations eliminate disputes.

Market Value Assessment: Know where you stand in today’s market if you’re considering a sale or partial liquidation.

Independent, Accredited & Compliant Appraisals

Meet Our Lead Appraiser – Mike Gutierrez

Grey Flannel Auctions has partnered with Mike Gutierrez of Pop Culture Appraisals, a nationally respected sports memorabilia expert and USPAP-accredited independent appraiser. Mike’s decades of experience and continued education in compliance with The Appraisal Foundation ensures every report meets the highest ethical and legal standards.

ISA Member, Independent USPAP-Certified Appraiser
With over 35 years of experience in sports memorabilia and pop culture collectibles, Mike Gutierrez is one of the most respected names in the industry. A former consultant for Antiques Roadshow and veteran authenticator for auction houses and institutions, Mike brings exceptional credibility and rigor to every appraisal. He holds active USPAP accreditation and is a member in good standing with the International Society of Appraisers (ISA).

Easy, Compliant Submission Process – No In-Person Required!
Per USPAP guidelines, your items do not need to be inspected in person. Email submissions are fully acceptable under current standards.