4.24 grams of nice gold.  This dinar is tied with four others for the highest grade at NGC.  There are 13 total including this coin graded by NGC for this date.
 
714 AD is just a few years after the successful invasion of Spain by Arab armies which subjugated the Visigothic kingdom and the people living under them.  
 
Continuing campaigns of Muslim domination of the Iberian Peninsula. Arab forces raid the valley of the Ebro River, and capture the fortress city of Zaragoza. Musa ibn Nusayr is made protector (wali) of Al-Andalus, with his capital at Seville (approximate date).
Tariq ibn Ziyad conquers the cities of Barcelona and Narbonne, where Visigothic nobles accept Umayyad overlordship, in return for autonomy in Septimania (Southern France). Muslims also raid Avignon and Lyon (approximate date).
The Arab generals responsible for the conquest of Spain, Musa ibn Nusayr and Tariq ibn Ziyad, are summoned back to Damascus by caliph Al-Walid I. They are ordered to deliver all the spoils of war. Musa complains and is stripped of his rank. Abd al-Aziz, son of Musa, becomes governor of Al-Andalus (modern Spain).