Is This The Final Nail In The Coffin For...
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No best answer has yet been selected by markreynolds. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Some people claim it was based on an Indian 500-rupee banknote which had a picture of a monkey on it, but neither that nor any other source has ever been authenticated. The answer to your question, therefore, is really: "Nobody knows." Click here for a website all about British money-terms. It confirms the fact that the source of �monkey' = �500 is unknown.