Universal Ring Dial, 4" diam., with plate to secure greater accuracy, unsigned, England Universal Ring Dial
Universal ring dial, brass, 3 5/8-inch outside diameter, Europe, 1701-1800. Universal Ring Dial 1701-1800
Portable Universal Ring sundial, by William Cary, London, with wood and cord suspension, in fitted wooden case Portable Universal Ring sundial 1789-1891
Astronomical Ring, brass, nearly 5-inches diameter; inscribed: "Nepos Gemae F. Louany fecit 1561" (indicating that it was made by one of the Arsenius brothers) with modern suspension ring Astronomical Ring 1561