Alfonso X, for example, made three issues of billon, in each of which the new coin was called a maravedí. His basic silver coin of 1258-1271 was also called a maravedí (maravedí de plata). It weighed 6.00 g and contained 3.67 g of fine silver. It was worth 30 dineros. At that time, the money of account was the Maravedí of 15 Sueldos or 180 Dineros, so that one maravedí as an accounting unit was worth six silver maravedí coins.

The silver maravedí money of account represented (according to one interpretation) about 22 g of silver