military_tech6 dan
Probable
Dan-Kyu System (1923-01-14)
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Posthumously awarded 6th dan by Jigoro Kano on 1923-01-14 after his death,
documented by Judo Channel with specific date and quotation
“January, 1923 6th Dan [...] Upon receiving news of his death, Jigoro Kano
awarded him a posthumous promotion to the 6th Dan on January 14, 1923”