Letter of Authenticity

A letter of authenticity is a letter that accompanies an object (usually a collectible or a item of high value) which certifies its authenticity. Due to the rise in fraud, letters of authenticity have become the lifeblood of the collectibles industry, and items without them usually drop in value significantly. If you are purchasing a collectible or something of high value, it is advisable to get a letter or authenticity with it.


Starting to Write


Include the official title or name of the item, artwork or collectible.


State what materials and medium was used to create the piece, such as “moulded out of pure .925 silver”.


Include the name of the creator, what year it was made, and in what country.


Specify any relevant technical details, such as dimensions.


If being authenticated by a authentication body, note the history of the item, how it has been authenticated, and by who (e.g. The Baseball Historians Association of America).


Use a coding system to give the piece a unique identifier.


Sign the letter and include contact information if relevant.

Sample Letters

Letter of Authenticity Sample

The item that accompanies this letter has been analyzed and documented by the Baseball Historians Association of America. Based on their findings, it has been verified that this was the baseball bat that Babe Ruth used to hit his record setting home run while playing baseball.


It has been recorded in the national register of baseball memorabilia, along with in the national collectors registration book.


This letter is to accompany this item wherever it goes, and is to be included on any sale of this item to future owners.


ITEM: Babe Ruth Baseball Bat

NOTE* This letter has been written in good faith by the Baseball Historians Association of America. We are not responsible for any financial damage this letter may cause.



Mitchell  P.  Martinez

3708 Green Avenue
Hayward,  CA  94545

Baseball Historian

Letter of Authenticity for Artwork Sample

This letter certifies that “Lady With The Ducks” is an authentic and original oil painting by Adrian Mateo, completed on March 10, 1983, in New York city.


It was created with artist quality oil paints on an un-primed cotton canvas roll of 300cm by 100cm.


Unique Code: 364763856


Adrian Mateo

Letter of Authenticity for Autographs Sample

This letter certifies that the accompanying item’s autograph is 100% genuine and that it was witnessed by the United States Sports Autograph Society.



This football jersey was hand-signed on April 18, 1993, by Manny Gutiérrez at the Superstars of Football convention in Albuquerque, New Mexico. The authenticity of this autograph is guaranteed  by the United States Sports Autograph Society, with unique serial number tags.


Signed by

Lydia McNulty

Managing Member

Letter of Authenticity Ford Sample

The Ford Performance Group certifies that Vehicle identification number 1C67YU439IP22 is a limited edition, 1972 Ford Cosworth, assembled at the Northampton, England plant, on 08/12/1970. This build was painted white.



Ford Performance Group