Kingdom of Castile. Alfonso X (1252-1284). Seisén A. Ávila? (No reserve price)

The Kingdom of Castile's coinage from the reign of Alfonso X (1252–1284) holds significant medieval historical importance. Alfonso X, also known as Alfonso the Wise, was a king noted not only for his rule but also for his promotion of literature, legal codes, and sciences. The "Seisén" was a medieval Castilian coin used during his reign, likely minted in Ávila, one of Castile's important cities. These coins were part of the early Spanish monetary system before the widespread adoption of coin denominations like reales and pesetas. They typically featured simple designs and were made of silver or billon (silver mixed with base metals), reflecting the economic practices of medieval Spain. Collectors and historians value these coins for their glimpse into medieval Iberian monetary policy and the reign of one of its most culturally influential monarchs.