The Collaborative International Dictionary of English v.0.48:

Mohur \Mo"hur\, n. [Hind., fr. Per. muhur, muhr, a gold coin, a
   seal, seal ring.]
   A British Indian gold coin, of the value of fifteen silver
   rupees, or $7.21 (in 1913). --Malcom.
   [1913 Webster] Mohurrum