Info please/ British India. East India Company - William IV Proof Restrike Rupee 1835-

This is my coin I have coming up in Heritages April auction. Seems kind of late to find out what I had.
What's the background and reason for a restrike and why King William IV ?
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Comments
Nice coin. I had no idea these were re-struck
8 Reales Madness Collection
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From another forum; I have no idea of the accuracy: "The Bombay Mint was notorious for doing Proof-like restrikes prior to 1970, when the practice of restriking coins from old dies was banned. The restrikes have a pitted & grainy appearance,due to the rusting on the dies. Most of the Bombay Mint restrikes were done between 1947 & 1970.The coins that were restruck were from the 1835 East India Company coins of King William IV,especially the gold 1 Mohur & 2 Mohurs.
The Bombay Mint even restruck the British Trade Dollars as well in gold as well as in silver."