1979, U.S.A. SOLAR ENERGY AND HELIOS THE SUN GOD. By Donald A. Borja. AE 73mm. Obv:? Helios encompassed by a single neutron and proton, his hands shackled. Rev: Helios freed, from his bonds,? in a horse-drawn chariot. Ninety-ninth issue of the Society of Medalists. Reported production of 750 in bronze. Alexander 99. No box or descriptive pamphlet. Extremely fine. $85. Sorry, SOLD