If any Barrel which shall be marked as proved under the recited Act or this Act shall by any Process of Manufacture, or by any other Means whatsoever other than the User and Wear and Tear thereof, be unduly reduced in Substance or Strength so as that the Mark thereon does not duly represent the Proof which if then duly proved it would bear, every such Barrel shall for the Purposes of this Act be deemed an unproved Barrel.