The medal's obverse bears busts of three Lithuanian kings, Mindaugas, Jogaila and Vytautas, facing left. Under busts, 1251 / 1387 / 1413; around edge, CHRISTIANITAS LITUANIAE LIETUVOS KRIKSCIONYBES JUBILIEJUS - 1987; signed under truncation at right, V KASUBA
The reverse bears three Christian churches, large cross and a coat of arms. In two blocks, MINDAUGAS / FILIUS SPECIALIS SANCTAE / ROMANAE ECCLESIAE / INNOCENTIUS IV; JOGAILA - VYTAUTAS / VICARII GENE-RALES SANCTAE / ROMANAE - ECCLESIAE / PRO TEMP-ORALIBUS + / MARTINUS V
The circular medal measures 76.2mm in diameter and was struck in bronze by the Medallic Art Company of Danbury, Connecticut. No mintage is reported.