An unusual coin from Perth Mint that not only looks beautiful, but also acts as an hourglass!  With an antique finish, the coin depicts an astrological design featuring the sun and phases of the moon. Inside the coin is an hourglass-shaped insert, filled with fine particles that mimic the flow of sand in the original device. 

The coin comes in a dedicated box with a certificate of authenticity.

The hourglass is believed to have been invented in the 8th century. It used the flow of fine sand from one bubble to another in order to accurately measure intervals of time. In addition to its uses in religious and civic life, the hourglass was also useful for sailors. Despite its displacement by mechanical clocks, the hourglass remains important in modern culture, symbolising the passage of time and the transience of all things.