
Front: King Bhumibol Adulyadej, Rama IX, in the full dress uniform of the Royal Thai Armed Forces, engraved three-quarter face in wine-red. To the left, the Garuda emblem, the issuer line "รัฐบาลไทย" with the legal tender clause, and the value spelled out as หนึ่งร้อยบาท above a large Thai numeral ๑๐๐. An orange royal cypher fills the guilloche rosette at centre; the serial appears twice, once in Thai figures.
Back: King Chulalongkorn, Rama V, in decorated court uniform on the right, sword in hand. Beside him a crowded relief-style tableau: the King standing on a dais among labourers and kneeling figures being unshackled — the abolition of slavery, the reform for which he is best remembered. Explanatory Thai text sits lower left, with the Garuda and state emblem in the upper corners and ๑๐๐ across the foot.
The Series 15 hundred, put into circulation in 2005 and printed in quantity for a decade. Series 16 replaced it from 2015 with a redrawn Rama IX portrait, and Series 17 followed in 2018 bearing King Vajiralongkorn. Earlier series remain legal tender, though these now turn up mostly in change from smaller upcountry shops.