2 1/2 Satang - Rama V Siam Anachak

Rama V — Chulalongkorn — introduced Western-style decimal coinage in the 1880s and 1890s as part of a sweeping modernization program explicitly designed to signal Siamese administrative competence to European colonial powers eyeing the kingdom from Burma and Indochina. The fractional satang denominations were central to that effort, replacing the older bullet-coin and pod duang monetary system that Europeans had long regarded as primitive.

The 2½ satang is an awkward fraction that never translated well into everyday commerce, and the denomination was quietly abandoned within a few years of introduction.