What Is MEARS Authentication?

MEARS stands for Memorabilia Evaluation and Research Services, founded in 2004 by Troy Kinunen, one of the hobby's first dedicated game-used bat and jersey authenticators. Rather than simply confirming a signature is genuine, MEARS researchers compare an item's physical characteristics — length, weight, labeling period, fabric, tagging — against factory production records and known photo-matched examples, then assign a numeric grade from A1 to A10 reflecting how confidently the item can be tied to the player and time frame claimed. MEARS also runs its own auction arm, MEARS Online Auctions, and operates a research center of production records used in its evaluations.

• A1-A10 numeric scale— an A10 bat or jersey matches known factory production details, shows significant signs of player use, and carries strong provenance or player-specific traits proving it could only belong to the examined player. Grades step down as researchers document point deductions for unverifiable details, inconsistencies, or missing records.
• Production-record research— for bats, MEARS compares recorded length (within a quarter inch), weight (within one to four ounces), model, and labeling period against known manufacturer records for that point in the player's career, rather than relying on a signature or sticker alone.
• Separate criteria per category— bats and jerseys are graded against different published criteria sets, since the physical evidence used to confirm game use (wear patterns, tagging, fabric, factory tolerances) differs by equipment type.
• Letters and grading opinions— unlike a sticker-and-population-report model, a MEARS evaluation centers on a written opinion documenting the research and reasoning behind the grade, which buyers can reference when assessing an item.

MEARS built its reputation on high-profile game-used authentications, including a Babe Ruth game-worn jersey Kinunen authenticated in 2012 that later sold for $4.4 million, and a 1923 Babe Ruth game-used bat that sold for $1.3 million. It also runs MEARS Online Auctions, giving it a combined authenticate-and-sell pipeline for high-end game-used memorabilia, separate from the card-grading and autograph-authentication companies most collectors deal with day to day.

• vs. PSA/DNA, JSA, and Beckett Authentication — those three focus primarily on autographs, opining on whether a signature is genuine and issuing a sticker or letter. MEARS focuses on game-used equipment itself, evaluating physical production evidence rather than ink.
• Numeric grade, not pass/fail— autograph authenticators typically issue a binary genuine/not-genuine opinion. MEARS issues a graduated A1-A10 score reflecting the strength of the evidence, closer in spirit to a card-condition grade than an authenticity sticker.
• Research-center model— MEARS maintains its own archive of factory production records, catalogs, and photo-matched examples specifically for bats and jerseys, a narrower and deeper focus than the broader autograph exemplar databases PSA/DNA and JSA maintain.

Confirm the exact card with Identify & Research — free-path first (on-device OCR, catalog match, and fingerprints). For how researchers tie a specific bat or jersey to a specific game — the technique behind those photo-matched examples — see What Is Photo-Matching in Sports Memorabilia?. For the general authentication landscape, see PSA/DNA vs. JSA vs. Beckett Authentication. For how to confirm a signed card's autograph specifically, see How to Tell if a Sports Card Autograph Is Real. For the manufacturer authentication model instead of after-the-fact examination, see What Is Upper Deck Authenticated (UDA), or for another witnessed-signing agency with its own hologram system, see What Is Steiner Sports. For card condition grading rather than game-used equipment, see PSA vs. BGS vs. SGC vs. CSG Grading.