Actually called Guavaberry Island Folk Liqueur, it is produced in Saint Marten.
And from Debi who sent us this from the bottle label: It is made from aged rum and local berries. The berries are found far off the road and high in the warm hills of the center of the island. It has a woody, fruity, bittersweet flavor. It can be sipped from a snifter or blended into many cocktails.