Like all coins in Thailand, its obverse features the King of Thailand, Vajiralongkorn, and previously Bhumibol Adulyadej. The newest set of coins features King Vajiralongkorn's royal monogram on the reverse side while the coins of the previous set featured Wat Phra Sri Rattana Satsadaram or Wat Phra Kaew, the royal temple in Bangkok's Grand Palace complex.
It is commonly called rian baht (Thai:เหรียญบาท) by Thai speakers (rian meaning "coin" in Thai).
Series
Evolution of 1 baht
1987
1972
1962
1957
1913
1908
1901
1876
1869
1862
2009 changes
On February 2, 2009, the Treasury Department announced changes to several circulating coins. The composition of the one-baht coin changed from cupronickel to nickel-clad iron, reducing the mass from 3.4 grams to 3.0 grams. The obverse image has also been updated to a more recent portrait of the king.[1]
2018 series
The Ministry of Finance announced on March 28, 2018 that the first coins featuring the portrait of His Majesty King Maha Vajiralongkorn Bodindradebayavarangkun will be put in circulation on April 6.
History
1855-1869, Gift from queen Victoria
During the reign of King Rama IV, also known as Mongkut, Siam undertook significant monetary reforms. To familiarize the population with “flat” coins and to compensate for the limited supply of traditional bullet money, cowrie shells, South American reais, and various regional currencies then in circulation, the government introduced in 1856 a series of transitional silver and gold coins produced by manual striking.[2]
In 1857, Queen Victoria of the United Kingdom presented King Mongkut with a small hand-operated coining press. The coins struck using this device became known as Rien Bannakarn (“Royal Gift Coins”). Due to the low production capacity of the manual press, minting soon ceased. However, Siam continued its efforts to establish a modern mint and subsequently acquired a steam-powered coining press from England. To house the new equipment, King Mongkut ordered the construction of the Sitticarn Mint within the palace grounds. The first coins produced on the new press utilized the dies of the Royal Gift Coins. These issues circulated alongside traditional sweat duang bullet coins, whose minting had been discontinued. Bullet coins were gradually withdrawn, melted down, and reused as metal for later flat-coin issues. A small number of sweat duang pieces were later struck by the next monarch as commemorative issues in memory of deceased relatives.[3]
Also in 1857, the government officially recognized exchange rates for certain foreign currencies that were already widely used in trade: 1 baht was set equal to 0.6 Straits dollars, and 5 baht to 7 Indian rupees.
1857/1860 2nd issue, 1 baht
The first machine-struck flat coins of Siam were released in 1860. This initial series comprised seven silver denominations: 1 sik, 1 fuang, 1 and 2 salung, and 1, 2, and 4 baht. Additional denominations followed, including tin 1 solot and 1 att coins in 1862, copper 2 and 4 att in 1865, and gold 2½, 4, and 8 baht coins in 1863. Many of these coins were struck at the Birmingham Mint and became popularly known as Rien. The word Rien is derived from real, a trading currency similar to the newly introduced coins.[4]
A total of 2,400 one-baht Bannakarn coins were struck. They circulated concurrently with the later one-baht coins of 1860, which were produced in far greater numbers on the new steam-powered minting press ordered from England. Because the differences between the Bannakarn pieces and the 1860 one-baht coins were not widely recognized, both types remained in circulation together. When these issues were eventually withdrawn and melted, the Bannakarn coins were destroyed along with the rest, making surviving examples rare. [5]
According to curator’s comments recorded in 1994, the “Royal Gift” coins were presented to the British Museum in 1857 by the Earl of Clarendon. The notes outline the historical context of minting reforms during the reign of King Mongkut (1851–1868), a period marked by the opening of Siam to international trade and the transition from traditional bullet-shaped currency to machine-struck flat coinage.
1869 3rd issue, 1 baht
In 1856, enquiries were made in Britain about the cost of supplying modern minting equipment to Siam. Correspondence between King Mongkut and Sir Robert Schomburgk, the British Consul, indicates that by February 1859 there was an acute shortage of silver bullet money, prompting the King to seek a press capable of producing 100,000 ticals per day. In March 1858 Schomburgk was instructed to procure a minting machine costing £2,000, along with two engineers to operate it. By this time, however, Queen Victoria had already gifted a small coining press to the King—adequate for experimental purposes but insufficient for large-scale production.
Schomburgk subsequently discovered that Siamese envoys had independently ordered a complete minting system from the British firm Taylor of Birmingham, the same manufacturer that had produced the Queen’s gift press. Their order, costing £3,000, was fulfilled, and the machinery arrived in Bangkok in 1858–1859. It was installed within the Grand Palace, and the official edict announcing the issuance of the new flat silver ticals was dated 17 September 1860.[5]
Throughout this era, Siam lacked a modern institutional framework to regulate its money supply. The Treasury operated primarily as a passive intermediary: When silver entered the country through trade, merchants sold it to the Treasury and received baht coins and when silver was required for the payment of imports, baht coins were exchanged back for silver bullion.[6]
Thus, the money supply fluctuated according to trade flows rather than formal monetary policy. The absence of regulatory tools meant that Siam’s monetary system was highly sensitive to global market developments, especially those affecting silver prices.
1869-1876, Transition
The designed slightly changed on the obverse where the Rama IV's seal used to be there, the coin was updated to contain Rama V's seal.[7]
1876 4th issue, 1 baht
1876-1909, Phasing out podduangs
During this era, podduangs and flat-coins co-circulate. The finess during this era was being standardized to 0.900 or 0.925 depending on where the coin is being minted. [8] Prior to this, the standard floated around 0.900 to 0.960. Under the silver standard, the value of the baht depended on the amount of silver it contained. Official specifications placed the baht at approximately 15.292 grams, of which about 90.625% was silver. As Siam’s trade expanded during the second half of the nineteenth century, the nation experienced a net inflow of silver because its exports consistently exceeded imports. This silver was sold to the Royal Treasury, which returned newly minted baht coins in exchange. The process led to a gradual but continuous increase in the domestic money supply.[6]
After 1870, global silver prices began to fall as silver depreciated relative to gold on world markets. For Siam, the decline raised the domestic cost of imports—many of which had to be paid for in gold-standard currencies such as sterling—while simultaneously encouraging exports. Concern over the rising cost of essential imports and the burden of servicing foreign loans denominated in sterling contributed to growing sentiment within the government to end reliance on the silver standard. In 1902, Siam formally abandoned silver convertibility, an important step toward a stabilized and modernized monetary system. Thus, abandoning the bi-metallic system. Podduang gradually became less circulated due to the massive production of flat-coins, and was formally phased out by 1900.
The designs also started including dates since 1901
1893-1910, Decimalization
1876 4th issue, 2nd variation 1 baht
The reign of King Chulalongkorn (Rama V) saw major transformations in Siam’s monetary and fiscal systems, culminating in the adoption of a decimal currency structure. On 21 August 1898, the Siamese government formally announced its intention to transition from the traditional multi-denominational system, formerly comprising thirteen interrelated units, to a simplified decimal system modeled on Western standards. The principal architect of this reform was Prince Jayanta Mongkol (Jayanta Mongkol, Prince Mahisara Rajaharudaya), a half-brother of the king and Minister of Finance from 1896 to 1906, later celebrated as the “father of Thai banking.” Under the new system, the baht (or tical/tikal)—a silver coin of approximately 15.033 g with .900 fineness—was divided into 100 satang, the term satang (สตางค์) being derived from Pali with the meaning “one-hundredth.” The reform also retained the salung (¼ baht) as an intermediate unit, as it aligned naturally with the new decimal structure.
The decimalization prompted the introduction of a new series of copper-nickel coins in denominations of 2½, 5, 10, and 20 satang, representing Siam’s first modern minor coinage. Although the government officially announced the full transition to the decimal system on 25 November 1902, elements of the earlier system persisted for several years: bronze coins based on the old att unit continued to be minted until 1905, and silver baht-based coins remained in production until 1910. Further changes were made in 1908, when Rama V introduced 1, 5, 10,25 ,and 50 satang coins .[3]
During 1907–1908, Rama V also commissioned a special issue of 1 baht silver coins from the Paris Mint, engraved by the noted French medalist Henri-Auguste-Jules Patey. These coins, depicting the king in middle age with a distinctive moustache, earned the popular nickname “mustache baht”. Although intended for circulation, they were not released before the king’s death in 1910 and were instead distributed by his successor, King Vajiravudh (Rama VI), at Rama V’s cremation ceremony. Upon ascending the throne, Rama VI retained the existing designs for small denominations, which continued to bear the legend “Kingdom of Siam” (สยามรัฐ), maintaining continuity with the final years of his father’s reign.
Throughout all of this, the old 1876 series 1 baht coin were continuously circulated.
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1910-1918, Last silver 1 baht coins
1913 8th issue, 1 baht
The final era of silver baht coinage occurred between 1910 and 1914, when Siam continued to mint the baht in solid silver according to long-standing specifications inherited from the silver-standard period. The outbreak of the First World War, however, caused a sharp rise in global silver prices, pushing the intrinsic value of the metal above the face value of the coin. As a result, Siam faced increased hoarding of high-value silver coins, widespread melting and withdrawal of baht pieces from circulation, and sharply rising production costs at the Royal Mint. These pressures led the government to scale back silver coinage and examine the possibility of transitioning away from precious-metal currency. By the late 1910s, the baht remained legally defined as a silver unit, but its continued production had become increasingly impractical.
Between 1916 and 1918, Siam began moving toward fiat, non-intrinsic coinage, particularly in the newly expanded nickel and copper satang denominations that replaced earlier silver fractions. Although the Royal Siam Mint maintained domestic production, foreign facilities such as the Paris Mint, first engaged under Rama V, were again utilized to supply dies and occasional coinage runs during the early reign of Rama VI. By the end of the First World War, the rising cost and scarcity of silver had effectively halted the minting of full-silver baht coins. These pieces remained in circulation but became progressively less common. As other silver coinage, mainly 25 and 50 satang coins, boar the brunt of the devaluations and debasement of silver until they weren't made of silver anymore.[9]
The last silver baht coins would be minted in 1957, in which the contained 0.030 or 3% silver content.[10]
1918-1957, 1 baht out of circulation
There were no 1 baht coins minted during this period.
from 1957 onwards, reintroduction of 1 baht coins.
Though there had been plans to introduce 1 baht coins during Rama VIII's series, no actual circulation coins were released, only patterns pieces were made.[11]
Last silver coin
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Beginning in 1957, Thailand introduced a new era of modern circulating coinage under the reign of King Bhumibol Adulyadej (Rama IX). That year marked the reintroduction of the 1-baht coin, produced in a billon alloy composed primarily of copper and nickel with small amounts of silver and zinc. The coin featured a portrait of King Bhumibol on the obverse and carried national emblems on the reverse, marking the first significant redesign of the baht in the post-war period. This issue signaled Thailand’s full transition away from intrinsic-value metals, following several decades of declining silver coinage and the adoption of fiat currency during the early 20th century. The new 1-baht coin weighed approximately 7.15 grams and measured 26.9 mm in diameter, reflecting a deliberate shift toward durable but inexpensive metals suitable for high-volume circulation.[12]
Further reforms occurred in 1962, when the 1-baht coin was revised and struck in cupronickel, establishing a composition that would define the denomination for much of the late 20th century. The following decades saw continued modernization of Thailand’s coinage, with adjustments to size, weight, and metal content to meet changing economic conditions and rising production costs. New denominations, such as the 5-baht and 10-baht coins, were gradually introduced, while fractional satang coins were resized and reduced in metal value as inflation and circulation patterns shifted. Throughout the Rama IX era, Thai coins underwent several portrait and reverse-design updates, which standardized designs that remained in use until the currency adjustments following the accession of King Rama X.
↑1Royal Gift Coinage | NumisBid. Numisbid.com. Published 2025. Accessed December 10, 2025. https://numisbid.com/encyclopedia/thailand/Royal%20Gift%20Coinage/
12Coins of Thailand - the history of minting with photos. Monedastodas.com. Published 2025. Accessed December 10, 2025. https://monedastodas.com/en/monety-tailanda-coins.html
↑เหรียญ - Wiktionary, the free dictionary. Wiktionary. Published 2022. Accessed December 10, 2025.
12Thailand Rama IV Baht coin collectible. Icollecteverything.com. Published 2020. Accessed December 10, 2025. https://www.icollecteverything.com/db/item/coin/34475/
12Ma Z, Saade N. HISTORY and ANALYSIS of the MONETARY SYSTEM of THAILAND, 1902 -1942. https://sites.krieger.jhu.edu/iae/files/2022/08/History-and-Analysis-of-the-Monetary-System-of-Thailand-1902-1942.pdf
↑1 Baht - Rama V, Thailand. Numista.com. Published 2025. Accessed December 10, 2025. https://en.numista.com/15249
↑1 baht Rama V 1876-1907 - Thailand (Siam) - www.cnumis.com. Cnumis.com. Published 2022. Accessed December 10, 2025. https://cnumis.com/en/catalog/thailand/vintage/1-baht-rama-v-59744
↑Brown I. Siam and the Gold Standard, 1902–1908. Journal of Southeast Asian Studies. 1979;10(2):381-399. doi:https://doi.org/10.1017/s0022463400014302
↑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
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