The one-baht coin is a currency unit of the Thai baht. It is commonly called rian baht (Thai:เหรียญบาท) by Thai speakers (rian meaning "coin" in Thai). Like all coins in Thailand, its obverse features King Bhumibol Adulyadej. Its reverse features Wat Phra Sri Rattana Satsadaram or Wat Phra Kaew, the royal temple in Bangkok's Grand Palace complex.
On February 2, 2009, the Treasury Department announced changes to several circulating coins. The composition of the one-baht coin changed from cupronickel to nickel-clad iron, reducing the mass from 3.4 grams to 3.0 grams. The obverse image has also been updated to a more recent portrait of the king.
1986 ~ 4,200,0001987 ~ 329,471,0001988 ~ 391,442,0001989 ~ 466,684,0001990 ~ 409,924,0001991 ~ 329,946,3801992 ~ 426,230,0001993 ~ 235,623,0001994 ~ 475,200,0001995 ~ 589,394,6501996 ~ 98,487,0001997 ~ 350,660,6001998 ~ 176,932,0001999 ~ 224,389,0002000 ~ 427,589,0002001 ~ 393,460,0002002 ~ 269,375,0002003 ~ 280,691,0002004 ~ 562,018,0002005 ~ 1,470,538,0002006 ~ 749,861,0002007 ~ 618,918,3162008 (old series) ~ 562,532,0002008 (new series) ~ 180,900,0002009 ~ 246,000,000Commemoration of King Bhumibol Adulyadej and the Queen Sirikit return from the World visit.The 3rd Cycle Birthday of King Bhumibol Adulyadej.The 5th Asian Games.The 6th Asian Games.Commemorative of the Food and Agriculture Organisation FAO (1972).Commemoration of HRH Crown Prince Vajiralongkorn.The 25th Anniversary of World Health Organisation WHO.The 8th SEAP Games.The 75th Anniversary of Princess Mother Srinagarindra.Commemorative of the Food and Agriculture Organisation FAO (1977).Commemoration of Princess Sirindhorn graduated from Chulalongkorn University.Commemoration of HRH Princess Sirindhorn.The 8th Asian Games.Commemoration of the World Food Day.The 50th Anniversary Celebrations of the King Bhumibol Adulyadej's Accession.