Thailand Denomination: 20 Baht Dimensions: 138 × 72 mm Main Color: Green. Date of issue: 3rd March 2003. Watermark: H.M. King Bhumibol Adulyadej. Obverse: H.M. King Bhumibol Adulyadej in the uniform of the Supreme Commander of the Armed Forces. Reverse: H.M. King Chulalongkorn (Rama V)