Catalog
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| Issuer | Thailand |
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| Year | 1991 |
| Type | Non-circulating coin |
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| Obverse description | Conjoined busts of King Rama IV (Mongkut) and King Rama IX (Bhumibol Adulyadej) facing right, with Rama IX depicted in the foreground wearing glasses and traditional Thai royal attire. The effigy of Rama IV appears slightly behind and to the left. A circular Thai-script legend runs along the upper and lower rim, naming both monarchs. |
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| Edge | Reeded |
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| Additional information |
Rama IX — Bhumibol Adulyadej — turned 63 in 1990, matching the age at which his ancestor Rama IV (Mongkut) died in 1868. Mongkut had spent 27 years as a Buddhist monk before ascending the throne at 47, and his reign reshaped Siam's relationship with European colonial powers through careful diplomatic maneuvering rather than confrontation. This coin marks the moment Bhumibol outlived him. Mongkut died of malaria contracted while observing a solar eclipse he had himself predicted using Western astronomical methods — one of the more precise ironies in Thai royal history.