2500 Baht - Rama IX International Year of Disabled Persons

Thailand's participation in the UN's 1981 International Year of Disabled Persons prompted this issue, though it arrived two years after the designated year — a scheduling gap common among Thai commemorative gold programs of the period, where royal approval processes and mint scheduling frequently pushed releases past the nominal anniversary date.

The .9166 fineness places it in the traditional 22-karat standard used consistently by the Royal Thai Mint for gold commemoratives under Rama IX, whose reign produced one of the most prolific commemorative coinage programs of any twentieth-century monarchy.