Authenticating Game-Used Baseball Bats

Authenticating Game-Used Baseball Bats

Game-Used BatsGame-used baseball bats are among the most highly coveted pieces of sports memorabilia. Bats, by their very nature, take a lot of abuse. As a result, each bat leaves evidence that can be used in the authentication process.

The older a bat is, the more difficult it is to authenticate. While this can be said for a lot of sports memorabilia, bats are made from wood, an organic compound. They are prone to damage that may result from improper storage. The effects of game use can diminish over time, making once tell-tale markings all but unusable in the authentication process.

How Companies Authenticate Game-Used Baseball Bats

There are three primary companies in the sports collectibles market that are relied upon for game-used authentication of baseball bats: MeiGray, MEARS and PSA/DNA. Even these experts make the occasional mistake. That's why it’s important that collectors be as self-educated as possible.

Each company uses a multi-step process for evaluating the authenticity of an alleged game-used bat. While the individual criteria might vary slightly from one company to  another, the general process answers these fundamental questions:

  • Are the manufacturer markings correct for the time period in which the bat was purported to be used?
  • Has the bat been altered in anyway?
  • What is the length and weight of the bat?
  • Do those metrics correspond to known examples used by the player?
  • Does the bat display game-used traits specific to the player?

Things to Look For

Licensed Major League Baseball vendors like Louisville Slugger keep detailed and accurate records. These records date back decades and can be viewed for research purposes. Teams and players place orders that detail the bat's weight, length, wood type and other characteristics. These can be used to validate if a specific make and model of bat was ever ordered and used by a particular player.

Mickey Mantle Maker's MarkGame-use indicators can include: ball marks, pine tar presence, taping pattern and player markings like uniform number and initials.

If a bat has authentic maker's marks and the presence of game-use traits, even the most seasoned authenticators can provide only an opinion as to whether the bat has been used in a game. All of this criteria is merely circumstantial evidence. The only way to factually determine actual game usage is a signed and witnessed affidavit from the player and detailed photo-matching of the player using the bat.

Photo-matching is an important tool used by authenticators. Digital imaging and photo restoration technology have been important advancements in photo-matching.

Additional Resources to Authenticate Game-Used Baseball Bats

Louisville Slugger Museum LogoGame-used authentication comes down to an educated guess. There are several resources available to collectors looking to add to or start a game-used bat collection. The following are particularly beneficial when evaluating the authenticity of bats alleged to be used by retired players.

With regards to current players or those just recently retired, in 2001, Major League Baseball instituted one of the most comprehensive authentication programs of the four major American sports. The entire process is regulated by an industry leading accounting firm. For a step-by-step guide to MLB’s authentication procedures, visit their website.

Other useful resources include the following books and articles:

While some science is involved, game-used bat authentication is still largely an art. There are people in the hobby who have dedicated years to becoming self-made experts.  Their opinions are well-respected by some of the country's leading auction houses. Due diligence by the collector is an important part of the authentication process as well. By not merely relying on an expert's opinion, and being educated about the process yourself, the added layer of scrutiny provides an even firmer basis for a piece's authenticity.

Top eBay Listings

Mark McGwire Game-Used Bat Photomint Highland Mint Historic 1998 Season! Rare!!!
$26.99

Ben Zobrist Game Used & SIGNED Mother's Day HOME RUN used bat MLB AUTHENTIC
$699.99

ORLANDO CABRERA Game Used Bat Indians Angels Red Sox not cracked Louisville
$99.99

HOF 1980-83 JIM RICE RED SOX GAME USED BAT, HEAVY SUPERB USE, UNCRACKED
$495.00

Reid Brignac Tampa Bay Rays Game Used Bat
$39.99

Wilmer flores game used in the nlcs .MLB authenticated bat.
$229.99

Ryan Zimmerman Autographed Signed Louisville Slugger Game Used Bat Nationals
$36.79

SEATTLE MARINERS ALEX JACKSON AUTOGRAPHED GAME USED BASEBALL BAT
$59.99

Josh Bard Mariners Dogers Nationals game-used autographed bat MLB BASEBALL
$29.98

MIKE AVILES GAME USED BAT PSA DNA MARUCCI MLB DETROIT TIGERS REDSOXS INDIANS
$175.00

Ken Griffey Jr. 1999 Game-Used Autographed Home Run Bat #37!!
$5,500.00

Bryce Harper Game Used Bat Rookie Year 2012
$4,650.00

Alexei Ramirez Maple old hickory Game Used Signed Bat Chicago White Sox
$48.00

Cameron Maybin 2010 Florida Marlins game used bat
$49.95

Rays Nationals JOSE LOBATON 2012 signed game used baseball bat
$89.99

1998-Los Angeles Dodgers Charlie Johnson Game-Used Baseball Bat – COA
$100.00
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Rob Bertrand

E-Mail Author | 
Rob is a former member of The Cardboard Connection Writing Staff and co-host of Cardboard Connection Radio.He is an avid collector with over 20 years of active experience in the hobby.

User Comments

  1. I have a Jackie Robinson/Louisville Slugger/knob initialed: JR35…. believed that he used in a game at Cincinnati…

    Also, a miniature,vintage Babe Ruth “mini” Louisville Slugger… As well as a number of framed, autographed baseball photos (Joe DiMaggio/Mickey Mantel together,Michael Jordan,Mark McGuire)

    Could you help with any value or interest in the JR35? Thanks, Jim

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