The uniface medal bears seated nude female figure holding scales in her right hand within geometric pattern border.  Downwards at right side, LIBRA; under crossed feet at bottom, © MACO - 1967

Chambellan's Zodiac medals were issued more than a decade after his death and are probably based on designs he made in the early 1930s when he was working on the RKO Roxy Theater.  The 1960s saw renewed interest in astrology and the signs of the zodiac arising in part from the counter-cultural hippie movement and its subsequent adoption into mainstream culture.

Libra is the seventh astrological sign in the Zodiac. It spans 180°–210° celestial longitude. Under the tropical zodiac, Sun transits this area on average between September 23 and October 23, and under the sidereal zodiac, the sun currently transits the constellation of Libra from approximately October 16 to November 17.

The symbol of the scales is based on the Scales of Justice held by Themis, the Greek personification of divine law and custom. She became the inspiration for modern depictions of Lady Justice.

The ruling planet of Libra is Venus. Libra is the only zodiac constellation in the sky represented by an inanimate object. The other eleven signs are represented either as an animal or mythological characters throughout history. Libra is one of the three zodiac air signs, the others being Gemini and Aquarius.

The Libra medal has unusually high relief, with the female figure's head rising a full 5mm above the medal's surface plane, effectively doubling the medal's thickness.

My silver variant is engraved on the reverse.  The dedication reads:  TODD H. OVERTON, J.D., M.D. / OCTOBER 12. 1937

The circular medal measures between 69.7 and 69.8mm in diameter and was struck in bronze and silver by the Medallic Art Company of New York.  No mintages are reported but based on my experience I believe the silver variant to be very rare.

References:   MACo 1967-151-010