At the edge of the sprawling campus of Mumbai University in Kalina lies a nondescript single-storied structure where few students venture — the Dinesh Mody Numismatic Museum.

Not many are aware what Numismatics — the study and collection of currency — is all about. An energetic middle-aged man, Mahesh Kalra, often spotted in the vicinity, is the curator of the museum that has amassed, among other rarities, a small compilation of coins which is highly relevant to the 2012 London Olympics.