This Silver Dirham coin was issued under Sulayman bin Yusuf (AH 423-448, 1031-1056 AD) of the Eastern Qarakhanids in Central Asia.   

It was minted in AH 428 (1037 AD) in Kashghar City.   The Numista rarity index of Numista-386441, is "100".   Extremely rare and hard to get coin.

Edge chipped.   Clearly struck and well preserved.

The previous owner of tihs coin, is Mr. Stephen Album!!!   The identification was judged by him.

Karakhanids or Ilek Khanids was a Karluk Turkic khanate that ruled Central Asia from the 9th to the early 13th century.  The Khanate conquered Transoxiana in Central

Asia and ruled it independently between 999 and 1089.  Their arrival in Transoxiana signaled a definitive shift to Trukic predominance in Central Asia.  The Khanate split

into the Eastern and Western Khanates in the 1040s.  In the late 11th century, they came under the suzerainty of the Seljuk Empire followed by the Qara Khitai (Western

Liao dynasty).  The Eastern Khanate ended in 1211, and the Western Khanate was extinguished by the Khwarazmian Empire in 1213.  

The capitals of the Kara-Khanid Khanate inclued Kashgar, Balasagun, Uzgen and Samarkand. 

[The above explanations are quoted from Wikipedia on each item.]

I will attach a public domain portrait of "Detail of a Kara-Khanid ruler, probably Uthman ibn Ibrahim", and shere free historical maps of "The Kara Khanid Khanate and

reighbouring polities in 1000 AD", and of "Kara Khanid Khanate as of 1006 AD" and of "Map of Khorasan and Transoxiana".  Kashghar City, the mint city, is located

at (39.4717, 75.9873) in the google location system.   I will attach some photos of the city from the google map system and from the google street view system.