French Indochina 1 Piastre

The French Indochina 1 piastre, or piastre de commerce, is a large silver trade coin introduced by French colonial authorities. It was established in 1885 across the territories of French Indochina—encompassing Cochinchina, Cambodia, Annam, and Tonkin—in order to improve monetary stability. Struck to compete with other silver trade dollars in East Asian commerce, such as the Spanish, Mexican, and Philippine pesos, the piastre became the principal currency unit of the federation alongside various subsidiary coins.

Originally issued on a silver standard of 24.4935 grams of pure silver, the piastre was equal to the Spanish silver dollar. Because the early strikes were heavier than the Spanish and Mexican reals circulating in the region, they were frequently hoarded by the local population. To maintain the coin in general circulation, colonial decrees issued in July 1895 and April 1898 reduced the silver 1 piastre to a total weight of 27 grams, containing 24.3 grams of pure silver. The denomination was subdivided into 100 cents, with each cent corresponding to between two and six traditional sapèques. The piastre remained anchored to the silver standard until 1920, and again from 1921 until 1930, after which it was pegged to the French franc.

Struck in silver, the obverse of the 1 piastre depicts a seated figure of Liberty surrounded by French lettering. The reverse displays the denomination expressed in both French and Traditional Chinese characters. These combined French and Chinese legends form a distinctive bilingual feature that identifies the piastre. Official decrees in 1906 formally prohibited chopmarked piastres from circulation, while terminating the legal tender status of foreign Spanish and Mexican silver reals.

Collectors should also check the weight, noting that strikes from 1895 onwards were reduced to 27 grams compared to earlier heavier issues.