One-siao coin
Thailand | |
| Value | 1/32 Thai baht |
|---|---|
| Mass | (1860-1874) 7.55 g (1874-1888) 11.35 g (1888-1905) 11.30 g |
| Diameter | (1860-1874) 22mm (1874-1888) 31 mm (1888-1905) 30 mm |
| Edge | Smooth |
| Composition | (1860-1905) copper |
| Years of minting | 1860-1905 |
| Obverse | |
| Design date | 1862 |
| Reverse | |
| Design date | 1862 |
The siao coin (Thai: เสี้ยว or เซียว) was a fractional-denomination coin used in the pre-decimal currency system of Siam (modern-day Thailand). The siao (เสี้ยว) represented a unit valued at 1⁄2 of a fuang or 1⁄32 of a baht, placing it among the smaller circulating denominations of the traditional baht-based system. Early siao coins were produced in the distinctive podduang (bullet money) form characteristic of Siamese coinage, while later issues transitioned to flat, struck metal coins during the 19th century monetary reforms. The siao coin remained in use until Thailand adopted the decimal baht–satang currency system in the early 20th century.[1][2][3][4]
It is also called pai when it was a podduang(Thai: ไพ).[1]
See also
References
- ^ a b LeMay J. Coinage of Siam. JSS 018_3b. The Siam Society; 2020. Accessed December 10, 2025. https://thesiamsociety.org/wp-content/uploads/2020/02/JSS_018_3b_LeMay_CoinageOfSiam.pdf
- ^ "1 Siao / ¼ Fuang - Rama IV, Thailand". en.numista.com. Retrieved 10 December 2025.
- ^ "1 Siao / ¼ Fueang - Rama V, Thailand". en.numista.com. Retrieved 10 December 2025.
- ^ "1 Siao / 2 Att - Rama V, Thailand". en.numista.com. Retrieved 10 December 2025.