Spanish Trail Commemorative Half Dollar 50c. This is a PCGS Graded Coin. You will receive the pictured coin. An attractively lightly golden toned example of a Key Commemorative. This coin commemorated the 400th anniversary of the overland trek of the Cabeza de Vaca Expedition through the Gulf states in 1535. This is an excellent coin to add to your collection. PCGS graded MS 64. Old Spanish Trail Half Dollar Commemorative. Obverse: Anna Nunez Cabeza De Vaca (Translated Head of a Cow). Reverse: Rout from Florida to El Paso.