Japanese Stamps Digital Museum

日露戦争凱旋閲兵式記念 << 1906年(明治39年) 4月29日 >>  みほん 2-1-5

Russo-Japanese War Triumphal Review* - Specimen -
Issued on April 29, 1905 (Meiji 39)

The Russo-Japanese War Triumphal Review Commemorative Stamp - Specimen -
Issued on April 29, 1906 (Meiji 39)
The Russo-Japanese War, which began in 1904 (Meiji 37), ended in September 1905 (Meiji 38) with the conclusion of the Portsmouth Peace Treaty. In April 1906 (Meiji 39) of the following year, the "Army Triumphal Army Ceremony" was held at the Aoyama Training Center in Tokyo.
This is a stamp commemorating the substantial victory.

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The above is only true for specimen stamps.
For more information and official printed stamps, see this.
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