I have just acquired this 1840 Rupee and the only info I have is from the Krause Cat and I am a little confused! It says there are three different Mints that minted the 1840 Rupee Bombay, Calcutta and Madras.  Am I right in assuming that if the truncation has only the engravers initial WW then it is from the Calcutta Mint? WWB or WWS = Madras  Bombay? This one only has W.W. on the truncation. Who is in the know on Indian coins? Thanks in advance Gary