The reign of King Rama V saw a significant development of the nation in almost every aspect including in monetary and financial system. In 1875, the King ordered a new Mint built, including installation of a new machine with greater production capacity and efficiency. The new Mint began producing silver coins with the royal portrait and the Coat-of-Arms design, making it the first time that the front side carried the profile of the ruling monarch. It became the operating format for later reign. HM ordered the issuance of new tin Solos coins bearing on the obverse the Phra Kiew (the coronet), and in the reverse, the Elephant inside Chakra design. The Phra Kiew is also called “Chula Mongkut” as the royal emblem of King Rama V.