The obverse bears a bust (l.) of Richard Byrd wearing aviator's goggles emerging from a bank of clouds. Across, COMMEMORATING THE CONQUEST OF THE POLES / BY REAR ADMIRAL RICHARD E. BYRD / AND HIS ASSOCIATES / PRESENTED BY / THE AERONAUTICAL CHAMBER OF COMMERCE OF AMERICA; along bottom edge, MAY 9 1926 - NOVEMBER 29 1929.
The reverse bears eagle perched on airborne Ford tri-motor; polar scene below, Signed at bottom right, KILENYI.
The bronze medal measures 82.4mm (3.25") in diameter and was struck by Whitehead & Hoag. During the presentation banquet one gold medal was given to Admiral Byrd, his associates received silver medals, and all other guests received bronze medals. The mintage is 1,000 pieces in bronze, 65 in silver-plate and 1 in 10kt gold.
According to Harry Waterson, the undisputed Kilenyi specialist, a piece in sterling silver might exist. It might be that an initial production run or a sample piece was struck in sterling silver but then, due to the Great Depression, subsequent pieces were struck in much less cheaper silver-plated base metal. Any updates on this question would be highly welcome.
References: Marqusee 217