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1 Tamlueng 'Dên Mêng Tong Bo' - Rama IV
| Issuer | Kingdom of Siam |
|---|---|
| Year | 1864 |
| Type | Non-circulating coin |
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| Reverse description | Central field displays a cusped lozenge (quatrefoil cartouche) with concave sides, containing Thai script inscription in the center. The four corners of the field, outside the cartouche, bear Chinese characters: 鄭 (upper left), 通 (upper right), 寶 (lower left), and 明 (lower right). Thai lettering กรุง สยาม appears within or adjacent to the central motif. The entire design is enclosed within a beaded border, presenting a harmonious bilingual layout reflecting the Sino-Siamese commercial context of the issue. |
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| Mint | Royal Mint, Bangkok |
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| Additional information |
The "Dên Mêng Tong Bo" designation refers to an experimental or pattern issue from Rama IV's reign — a period when Siam was actively modernizing its monetary system under pressure from Western trade partners demanding standardized coinage. Rama IV, better known outside Thailand as Mongkut, brought European minting technology to Bangkok precisely to produce machine-struck coins that foreign merchants would accept at face value.
The KM# Pn13 classification confirms this as a pattern, meaning it almost certainly never entered general circulation. At over 60 grams of gold, producing it at scale would have been prohibitively expensive even by royal treasury standards.