Spain 10 Euro 2008 Alfonso X 'El Sabio'. Juan Carlos I (1975-2014). Obverse: Portrait of S. M. the King of Spain; Don Juan Carlos I. Lettering: JUAN CARLOS I REY DE ESPAÑA · 2008 ·. Reverse: On the back is reproduced; in the central part; the seated statue of King Alfonso X the Wise; made by J. Alcoverro for the staircase of the main facade of the National Library of Spain. Lettering: 10 EURO M ALFONSO X EL SABIO odigo de los siete portidos. Edge Reeded. Silver (.925) 27g. KM 1203