Innocuously light in both flavour and alcohol. Add a shot of triple sec and you are well on your way to making a Cosmopolitan.
Thought to be the forerunner to the Cosmopolitan. A 1968 bottle label from Ocean Spray's archives lists the Harpoon as a "new cocktail". It was originally launched as being 2 ounces Ocean Spray cranberry and 1 ounce vodka or light rum served "over the rocks or tall with soda. Suggested garnish: a splash of lime or lemon optional." In 1970, it was updated to also list gin as a possible base spirit.