The 2018 (2561) Thailand 1 Baht coin is a standard circulation coin with a round shape and a diameter of 20mm. It features the bust of King Phra Vajira Klao (Rama X/Vajiralongkorn) on the obverse and a crowned monogram on the reverse. The coin is composed of nickel-plated steel and has a reeded edge. It was minted at the Royal Thai Mint and came in a small mint bag. The obverse lettering reads "Maha Vajiralongkorn Rama X" and the reverse lettering reads "Thailand BE2561 1 Baht 1."