A nice plaque and good find but I would not call your authentication to be at nearly the same level as that used by Major League Baseball for game autographs and game balls:

Off-duty law enforcement officers working as independent contractors are assigned by Authenticators, Inc. to authenticate autographs and game-used memorabilia at every Major League Baseball game. Only those items that an authenticator actually witnesses being signed or used in a game may be eligible for authentication under the MLB Authentication Program. Once witnessed, authenticated items receive a tamper-proof hologram created by OpSec, U.S. with a unique alphanumeric combination to easily identify their authenticity.

Hologram introduced in 2022:

Unique two-letter hologram prefix
Unique serial number for each item that when combined with prefix allows collectors to cross-reference product against the database on MLB.com
Validation Code containing three randomized letters
QR Code containing hologram prefix and unique serial number
Major League Baseball silhouetted batter logo indicates item is part of the Major League Baseball Authentication Program