f your 1905 French Indo-China Piastre coin features a design with the facing direction of the portrait reversed (right-facing instead of left-facing), it could be due to a few possible reasons:
Mint error: A mint error occurs when a coin is struck with a mistake during the minting process. In this case, the error might be a result of the die being incorrectly oriented, causing the portrait to face right instead of left.
Counterfeit coin: A counterfeit coin is an intentionally manufactured fake that mimics the appearance of a genuine coin. If your coin appears authentic in every way except for the facing direction, it might be a counterfeit.
Die variety: Sometimes, a mint may produce multiple versions of a coin design, including variations in the orientation of the portrait. These variations are known as die varieties, and they can be highly collectible.
France ruled it, and this is why it was called "French" Indochina.
The French had fought there from 1946 to 1954; 1st Indochina War or French Indochina War.
Invasion of French Indochina happened on 1940-09-26.
The French and the Japanese
Second French Indochina Campaign happened on 26-03-09.
France was the only European Nation fighting in the 1st Indochina War (also known as the French Indochina War or French War).
Only as men of the French Foreign Legion during the French Indochina War 1946-1954.
The French Indochina War 1946-1954 (aka 1st Indochina War).
French Indochina War or 1st Indochina War.
The Vietnamese
French Indochina War (or 1st Indochina War) 1946-1954.
Brazil was not part of French Indochina before world war 2.