1942
No imitations

Ever since the World Fair of 1893, people have tried to pass off false promises as real Blarney.
In 1942, the US Federal Trade Commission was moved to action on greeting cards. Manufacturers were restrained from the use of any ‘delusive, artful or adroit statement having the capacity or tendency to mislead purchasers or cause belief that fragments were actually taken from the real Blarney Stone’.
There is only one Blarney Stone and it can only be found inside Blarney Castle. Beware of imitations.