2368: Sir Isaac Newton's Anti-Counterfeit Technique Jun 12, 2021

In the Middle Ages and even into the 17th century, coin clipping (also including shaving) wherein some amount of the money is removed. One way devised as an anti-counterfeit measure by Sir Isaac Newton in 1696 when he was Warden of the Royal Mint was to use grooves on the edge such that shaving and clipping would be easier spotted. One phrase inscribed on these coins after this was DECUS ET TUTAMEN meaning "an ornament and a safeguard". This is actually a phrase from Virgil's Aeneid and was printed on British coins for many hundreds of years.