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Helpfully, Naismith had "a powerhouse of early mediaeval numismatic research" on his doorstep: The Fitzwilliam Museum.

In addition, due to their rarity, numismatic coins also hold value based on their age, condition and mintage numbers.

One option for your portfolio is to invest in numismatic coins.

Hobbyists and enthusiasts who collect numismatic currency will pay you a higher amount in fiat than the face value of your certificate.

The $4.2 million was the most ever paid for an ancient coin, according to the Numismatic Guaranty Corp.