One-sik coin
The sik coin was a fractional-denomination coin used in the traditional pre-decimal currency system of Siam. The sik represented a value of 1⁄16 of a baht, equivalent to 1⁄2 of a fuang or 2 siao /2 pai. Positioned between the fuang and siao denominations, the sik coin formed an important intermediate unit within the non-decimal baht system used before the monetary reforms of the late 19th and early 20th centuries.
Early sik coins were issued in the characteristic podduang form, cast or hammered into pod-shaped lumps of silver or gold. During later reforms under Kings Rama IV and Rama V, sik coins transitioned into modern flat, struck silver or copper-alloy coins, aligning Siamese currency with international minting standards. The denomination became obsolete following the adoption of the decimal baht–satang system, which replaced all traditional subunits including the sik.
The sik coin of the 1876 series was the largest circulating coin ever produced