The standard weight for a 3¢ Nickel coin is 1.94 grams, with a tolerance of +/- 0.26 grams. Therefore, this rare off-metal is within the limit for a 3¢ Nickel planchet since it weighs 1.68 grams. There were no other similar weight planchets of the copper and nickel composition in use at the Philadelphia Mint in 1876.
Indian Cent off-metals are very rare. This mint error is sharply struck with very reflective fields. It is also a rarer date and is in gem mint state condition.