diameter: 30.6mm (1 3/16 in.)
White metal struck medal with obverse showing left-facing hatted bust-length profile of Columbus; legend: "1892 CHRISTOPHER 1492 COLUMBUS". Reverse shows central brass-colored inset with letters "MTWTFSS" around center surrounded by pairs of month abbreviations with letters in six segments; legend in outer ring: "PERPETUAL CALENDAR. PATD. 1891 & 1892 BY W.W. KITCHEN"
Gift of the Naval History Society, 1925
Due to ongoing research, information about this object is subject to change.