20 Riels - Norodom Sihanouk Nothosaurus

Issued under Norodom Sihanouk following his restoration to the Cambodian throne in 1993, this coin belongs to a wave of wildlife-themed silver issues that Cambodia produced throughout the 1990s — a period when the country's mint infrastructure was essentially nonexistent and production was contracted entirely to foreign facilities. The Nothosaurus, a semi-aquatic Triassic reptile extinct for roughly 210 million years, is an unusual subject choice with no particular connection to Cambodian natural or paleontological history, suggesting the series was aimed squarely at the international collector market rather than domestic circulation.