A gold tanks minted by the Bahmanid sultan Ahmad II, in 855 AH (1451/2)

Source: http://www.vcoins.com/ancient/parscoins/store/viewItem.asp?idProduct=3574&large=1
(downloaded Sept. 2006)

"BAHMANID, Ahmad II. 1435-1457 AD. Gold Tanka (11.11 gm; 21 mm). Muhammadabad Mint, dated 855 AH."

A silver half-tanka coin issued by Muhammad I, AH 903 (1497/8)

Source: ebay, May 2007

A silver tanka coined by Mahmud Shah I, 1503-12

Source: http://www.vcoins.com/ancient/coinindia/store/viewitem.asp?idProduct=251
(downloaded July 2007)

"GUJARAT SULTANATE, Mahmud Shah I: Silver heavy tanka, Muhammadabad. Obverse  Legend, within a double ruled circular border with dots in between. Reverse  Legend, within double ruled square border. Date  AH 909-917 (= 1503-1512 CE). Weight  10.75 gm. Diameter  20-21 mm."

And a later gold tanks minted in 952 (1545/6) by Nasir ud-Din Muhammad Shah (r.1537-53)

Source: http://www.vcoins.com/ancient/parscoins/store/viewItem.asp?idProduct=2347&large=0
(downloaded Mar. 2006)