The medal's obverse bears 12 disks with the signs of the zodiac surrounding central disk with sun.

The reverse bears calendar surrounded by four scantily clad maidens, possibly nymphs, with cornucopia, sun, grapes, and tree.  At left bottom, 1978; signed at bottom right, (JOV monogram)

The circular medal measures 76.2mm in diameter and was struck in various metals by the Medallic Art Company of Danbury, Connecticut. No mintages are reported and I am only speculating that there was a silver variant.  The edition limit for the gold-plated bronze medals was 1,000.

References:   MACo 1977-107, Cal MA-1978