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Gilbert MainesLeon: a financial consultant once told me that if your investment doubles in value every seven years, it should be considered a good choice (not a great choice).
The math on your card works out to: if by year 2009, the card is worth $25.60 it should be considered a good choice, if you obtained it in 1960.
Edited to add: so it really has done 1000x better than that - as we all knew.