The Saffarids of Sistan were a later branch of the Saffarids. The great Saffarid dynasty had come to an end thanks to the Ghaznavids.
The Nasrid family clan took over control of the Sistan/Nimruz area as Ghaznavid, and later Ghorid, vasals. The best known Nasrid ruler was Taj-Ud-Din Harb. He had a long reign from 1167 to 1215AD. His coinage is quite abundant. Several types have been shown on the forum before.
After Taj-ud-din Harb, a number of short lived rulers filled the short interlude to the invasion of the Mongols around 1222AD, which brought an end to the dynasty.
Below is a coin of one of these rulers, Taj-ud-din Nasr bin Bahramshah. He was put on the throne by the local nobles in 1221, bus soon replaced by his brother Rukn-ud-din Abu Mansur. Apart from this, not much is known of this historic figure. His coinage is easily recognized as "typically" Sistan, but it is scarce. Though a bit off-centre, most of the inscription is very nicely readable.
BI 17 mm max, 2.54 gr, Tye#127