Nobel laureate Ernest Walton and his groundbreaking achievements in the field of physics are the focus of Ireland's first commemorative coin of 2015. 

The Proof .925 fine silver €15 coin, designed by Rory Breslin, is the second in Ireland's Science and Invention series. 

The reverse shows an artist’s impression and explanation of Einstein’s famous mass, speed and energy equation, E=mc2. 

The obverse bears the traditional Irish harp design.

The coin weighs 28.28 grams, measures 38.61 millimeters in diameter and has a mintage limit of 6,000 pieces.

The coin was officially issued at a price of €44.

A U.S. distributor offers the Irish coin at a fixed price of $67.50 in U.S. funds.

To order, visit the Coin & Currency Institute website.

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