Someone altered a British India coin to imitate a more valuable coin by filing down the edges. The person went to a lot of work to increase the value of the coin from three US cents to twelve US cents.

Copper-nickel, 19 mm, 3.38 gm, Krause KM 513

I acquired this coin sometime in the 1960's from a California dealer's foreign coin box. I examined it later and saw that it was a 1917 British India 1 anna coin filed down to the size of a 1/4 rupee coin. Who ever did it even inserted edge reeding to make the coin feel authentic. As there were 16 annas to the rupee, this alteration quadrupled the value. The anna was then worth around three US cents so the person made a nine cent profit.

Copper-nickel, 21 mm, 3.87 gm, Krause KM 513