A silver tanka issued by Sher Shah Suri from the Sharifabad mint, with Devanagari script on the left face

Source: ebay, June 2007

Another example: an Agra-Gwalior type silver tanka of Sher Shah's, with Nagari inscriptions included in  the border on the right face

Source: ebay, June 2007

A particularly beautiful example: a silver rupee from AH 947 (1540/1)

Source: http://www.vcoins.com/ancient/coinindia/store/viewitem.asp?idProduct=696
(downloaded Feb. 2008)

"DELHI SULTANATE, Sher Shah Suri (1538-45) Silver rupee, Jahanpanah type, AH 947. Obverse: Legend, including name in Nagari and date (947). Reverse: Legend. Date AH 947 ( = 1540-41 CE). Weight  11.28 gm. Diameter  27 mm."

One of Sher Shah's last silver rupees (minted 1543/4)

Source: http://www.vcoins.com/ancient/coinindia/store/viewitem.asp?idProduct=624
(downloaded Feb. 2008)

"DELHI SULTANATE, Sher Shah Suri (1538-45) Silver rupee of Gwaliar, AH 950. Obverse: Legend, including name in Nagari and date (950). Reverse: Legend. Date AH 950 ( = 1543-44 CE). Weight 11.33 gm. Diameter 29 mm."

A silver tanka minted by Islam Shah Suri (Sher Shah's son), r.1545-52; the king's name in nagari script is in the lower left border

Source: ebay, Jan. 2006

A silver rupee of Islam Shah's, minted in 1548/9, with his name in nagari on the left face

Source: http://www.vcoins.com/ancient/coinindia/store/viewitem.asp?idProduct=641
(downloaded Feb. 2008)

"DELHI SULTANATE, Islam Shah (1545-52) Silver rupee, Chunar, AH 955. Obverse: Legend, including name in Nagari. Reverse: Legend, including date (955). Date AH 955 ( = 1548-49 CE). Weight 11.47 gm. Diameter  25 mm."

One of the last coins of Islam Shah Suri: a silver rupee, 958 AH (1551), probably minted in Bengal, with his name in Devanagari script on the right face

Source: http://www.anythinganywhere.com/commerce/coins/coinpics/indi-dehli.html
(downloaded Jan. 2006)