20 Baht - Rama VI Thai Health

Issued to mark the centenary of Thailand's first public health infrastructure under Rama VI, who established the country's initial medical and sanitation frameworks in the years following 1918 — a period when influenza was killing tens of thousands across Southeast Asia. The commemorative program under which this coin falls has produced dozens of similar circulation-quality pieces since the 1990s, making individual issues largely undistinguishable in collector demand from one another.

Y#578 is a catalog placeholder for a series that the Royal Thai Mint has never fully rationalized in standard references.