THEME

The 2026 Greek €10 Silver Proof coin honors the Hydraulis of Ctesibius , the world's first known keyboard musical instrument and one of the greatest technological achievements of the ancient Greek world. Invented in the 3rd century BC by the Alexandrian engineer Ctesibius , the hydraulis used water pressure to regulate airflow through a series of pipes, producing remarkably powerful and controlled musical tones. This groundbreaking invention laid the foundations for the development of the pipe organ, influencing musical instrument design for more than two thousand years. The hydraulis spread throughout the Roman and Byzantine worlds before evolving into the modern church organ that remains central to Western sacred music today. The coin's design is based on the scientifically reconstructed instrument displayed at the Kostas Kotsanas Museum of Ancient Greek Technology , celebrating the ingenuity and lasting legacy of ancient Greek engineering. Struck in exceptional Proof quality by the Greek Mint, this coin is a remarkable tribute to one of history's most influential inventions and a superb addition to any collection dedicated to music, science, or ancient technology.