The 2018 $1 Evolution of Industry 1oz Silver Gear Shaped Two Coin Set by Perth Mint is a unique and stunning addition to any silver collection. Each coin in the set is made of 1 ounce of .9999 pure silver and is shaped like a gear, representing the evolution of industry. The set includes two coins with different designs, both featuring intricate detailing and a proof finish. With a limited mintage of only 3,000 sets worldwide, this set is a must-have for any collector or investor. Each set comes with a numbered certificate of authenticity and a display case, making it the perfect gift or display piece.