Saffarids of Sistan, Nasr. 1221 AD, billon Jital

[capnbirdseye]

A scarce coin from a rare ruler who presumably barely reached just one year before his demise

Tye#127

[THCoins]

Great coin ! I think there was a bit of a minting technique problem at the time. As mine (shown here) has a very similar flan crack.

Taj-ud-din Nasr was soon replaced by his brother Rukn-ud-din Abu Mansur, who also did not last long.
So as an addition:
Obv: “Rukn-al-din / abu Mansur bin / Bahramshah”.
Rev: “Allah / Muhammad / rasul Allah / al-Nasir al-din”.
(BI, 19 mm, 3.85 gr, Tye 128, Album-1430, rare)

[capnbirdseye]

Abu Mansur very clear 

  I wonder why the flans cracked, it's what you might expect from cast metal

[Figleaf]

I think the die was insufficiently heated or had cooled off too much before it was struck, reducing the elasticity of the metal on the outside towards the edge.

Peter

[THCoins]

Another factor may have been the metal composition of the coins, as these seem to cointain a high percentage of lead in the alloy.