1718-1762 Quarter Guineas The Quarter-Guinea and Other Problems - The Quarter-Guinea was only issued twice: once in 1718 by George I, and once in 1762 by George III. Both times it was a means to an end, and the end wasn't exactly successful. This is the story of the Quarter Guinea, it's problems and how Sir Isaac Newton moved from a bi-metallic standard towards the Gold standard to prevent a run on silver.