Sports Memorabilia Appraisal
Every appraisal is handled personally, with care, clarity, and professional rigor — free from pressure or incentive — so clients can understand what they have, what it’s worth, and why it matters.
Expert Valuations for Your Sports Memorabilia Collection
Whether you need a formal sports memorabilia appraisal for insurance, estate, tax, legal, or sale purposes, you need a valuation you can trust — one that clearly defines what you have and what it’s worth.
Baseball in the Attic provides standards-based sports memorabilia and sports card appraisals accepted by attorneys, courts, the IRS, insurance carriers, auction houses, and museums. The practice is led by Michael Osacky — ISA-accredited, USPAP-compliant, and Lead Appraiser at PSA, the largest third-party authentication and grading company in the world. Each report follows the Uniform Standards of Professional Appraisal Practice (USPAP), the nationally recognized framework governing ethical, defensible valuation work.
Michael Osacky w/ Ernie Banks
Recent Valuations
Item
Brooklyn Tigers vs. Washington Redskins Program 11/12/1944
Type
Football Memorabilia
Year
1944
Appraisal Value:
$225
Item
Walter Payton Signed Jersey (PSA/DNA)
Type
Football Memorabilia
Year
-
Appraisal Value:
$4,000
Item
New York Yankees World Series Champions Team Signed Baseball (JSA)
Type
Baseball Memorabilia
Year
1932
Appraisal Value:
$15,000
Item
Oakland A’s World Champions Trophy
Type
Baseball Memorabilia
Year
1973
Appraisal Value:
Private
Item
Jackie Robinson Single Signed Baseball (JSA)
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$8,000
Item
Roy Campanella Single Signed Baseball (Pre-Accident)
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$35,000
Item
Cy Young Signed Baseball
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$40,000
Item
University of Illinois Homecoming Pin
Type
Football Memorabilia
Year
1924
Appraisal Value:
$300
Item
Jackie Robinson Signed Check
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$4,250
Item
Michael Jordan Air Jordan 1 Game Used & Signed Sneakers
Type
Basketball Memorabilia
Year
1985-1987
Appraisal Value:
Private
Item
Babe Ruth Signed Program PSA/DNA AUTO 9
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$6,000
Item
Heisman Trophy Award (Pre-1970s)
Type
Football Memorabilia
Year
Pre-1970s
Appraisal Value:
Undisclosed
Item
Babe Ruth Signed Baseball
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$150,000
Item
Los Angeles Dodgers NL Champions Ring
Type
Baseball Memorabilia
Year
1978
Appraisal Value:
$4,500
Item
Panini NFL Immaculate Unopened Box
Type
Football Memorabilia
Year
2018
Appraisal Value:
$3,500
Item
Babe Ruth Double Signed Bowling Scoresheet (PSA/DNA)
Type
Baseball Memorabilia
Year
-
Appraisal Value:
$13,500
Item
Beijing Olympics Basketball Gold Medal
Type
Basketball Memorabilia
Year
2018
Appraisal Value:
Private
Item
Post Cereal #109 Sandy Koufax (Canadian)
Type
Baseball Memorabilia
Year
1962
Appraisal Value:
$275
Item
Jordan 4 Retro Oregon Ducks “Duckman”
Type
Basketball Memorabilia
Year
2013
Appraisal Value:
$10,500
Item
Super Bowl LI Championship Ring Presented to Significant Player
Type
Football Memorabilia
Year
2017
Appraisal Value:
Private
Item
World Series Game 4 Full Ticket (Ty Cobb World Series Home Debut)
Type
Baseball Memorabilia
Year
1907
Appraisal Value:
$30,000
Valuations
Meet Michael, the
“Dean of Cracker Jack Baseball Cards”
Michael Osacky.
PSA’s Lead Appraiser, USPAP-compliant, Accredited Member of the International Society of Appraisers (ISA)
Michael Osacky’s love for the hobby began with a shoebox of baseball cards passed down from his grandfather — cards tucked away, saved carefully, and cherished long before anyone thought about market value. That early spark grew into decades spent immersed in sports history, handling rare collections, and understanding how condition, context, and provenance shape worth. Today, he is known as the “Dean of Cracker Jack Baseball Cards,” a title given by Forbes Magazine, and is arguably the world’s leading sports memorabilia appraiser.
The Appraisal Process: Expert Valuations for Your Collection
Step 1
Initial Conversation & Photo Review
Every appraisal begins with a conversation. Michael asks a few key questions and reviews photos to understand the collection and its purpose. For large collections, a photo of every single item is not required.
Step 2
In-Person
Inspection
Appraisals are handled personally by Michael, typically through an in-person evaluation to accurately assess condition, authenticity, and scope.
Step 3
Formal Appraisal Report
A written appraisal is completed using research, market data, and professional standards, suitable for insurance, estate, legal, or planning needs.
We Appraise Vintage Sports Cards, Autographs, Jerseys & More!
Sports
Cards
Game-Used Equipment
Autographed Memorabilia
Trophies
& Awards
Championship
Rings
Collections & Rare Finds
Why Choose Our Sports Memorabilia Appraisal Service?
A professional appraisal provides clarity, documentation, and an objective foundation for decision-making. Whether planning ahead or managing an inheritance, clear valuation helps protect family relationships and support responsible financial choices.
Accredited & Standards-Based
Every appraisal follows USPAP and nationally recognized professional standards accepted by attorneys, courts, the IRS, insurance carriers, auction houses, and museums. Reports are objective, defensible, and prepared for formal review.
Nationally Recognized Expertise
Michael Osacky has spent a lifetime in the hobby and serves as Lead Appraiser at PSA, the largest third-party authentication and grading company in the world, and has acted has appraised numerous items donated to the Baseball Hall of Fame.
Direct, Conflict-Free Evaluation
Each appraisal is completed personally by Michael. There is no sales incentive or competing interest in a future transaction — only independent valuation grounded in research, market data, and decades of experience.
Our Appraisal Services: What We Evaluate
Baseball in the Attic appraises vintage and modern sports memorabilia, autographs, and collectibles across all major sports, specializing in historically significant material from the 1870s through the 1970s.
As Seen In
What Our Clients Are Saying
Michael did a great job reviewing my card collection, which is primarily baseball-focused, with an emphasis on early Detroit cards. His follow-up investigation and subsequent appraisal report were amazing.
Bob, Michigan
There is no one like Michael Osacky. Not only do I have a complete record of every item, but I also have an identifiable index with descriptions and appraised values that can be forwarded to insurance companies.
Andy H., Los Angeles, CA
Michael appraised my dad’s Yankees signed baseball collection—extremely valuable not only monetarily but for its many memories and family connections. I’m happy I trusted Michael and am thoroughly satisfied with his work. A pleasure to work with and highly recommended.
Ed H., New York City
Michael is a true professional who delivers detailed, timely reports that help clients value their collections. His expertise in sports cards and memorabilia stands out. I highly recommend Michael.
Corey B., Business Manager, Los Angeles
Michael’s approach is friendly and professional, and his written explanation of how he conducts his appraisal is quite detailed and impressive. It was a pleasure to work with Michael, and I endorse him with great confidence.
John A., Boston
In a hobby full of proverbial minefields, I always exercised caution when dealing with new people. Luckily, Michael is one of the hobby’s most knowledgeable and trustworthy professionals. He is proficient, pleasant to work with, and very communicative.
Lou F. Baltimore, Maryland
My father is the late Charlie O. Finley. My family’s memorabilia needed to be insured. Michael Osacky came highly recommended. He was honest, knowledgeable and thorough with his appraisal. I would use him again.
Marty F., Indiana
Michael helped me to authenticate and appraise a Babe Ruth autograph that has been passed down through my family and holds great personal importance. Michael went above and beyond, recommending a restoration expert and then working with me to appraise the item. I could not be happier!
Shauna M., Rhode Island.
Michael completed an appraisal of a premium box suite at MetLife Stadium for donation purposes. Throughout the entire process, he demonstrated exceptional professionalism, technical expertise, and a strong commitment to accuracy. I confidently recommend Michael for any future appraisal assignments involving premium event spaces, hospitality suites, or similar assets.
Sean B., Princeton, New Jersey
It was a pleasure to work with Michael. He is a gentleman. His knowledge of the players and their cards is extraordinary. I highly recommend him.
Peter H., retired lawyer, Connecticut