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ṭanka

In India, ? – 19ᵗʰ century,

Ṭanka, S. ( ) a weight of silver equal to four máshas; among the Maraṭhas the Ṭank, or Ṭánk ( , ) is variously rated at four or nine máshas, or as the same with a tola, or the seventy-second part of a pakka sèr : a coin, a stamped coin in general ; whence it came to be applied, sometimes slightly modified, to specific coins in different metals.

H. H. Wilson, 1855, page 508.