The name given to a pat- tern Penny prepared in 1789 by Mossop, a jeweler and die-sinker, of Dublin. Only six specimens are said to have been struck, and two of them were presented to George III. Its rarity is due to the fact that the die for the reverse broke.
The name is given to this pattern on account of the emblematical figures of Brit- annia and Hibernia on the reverse. The engraving is after a design by Sir Joshua Reynolds.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)