The young man in this small snapshot is wearing a military tunic with no insignia. He may have been serving as a musician in the Imperial Japanese Army. The photo is blank on the back, so it’s hard to say when it was taken, but I’d guess it was printed in the 1930s.
At the bottom right of the photo is an embossed stamp (blind stamp) with the words “Hiroshima” and “Hachimarukan.” Presumably, Hachimarukan was the name of the photographer, but I haven’t found any information about him online.
Margaret Mehl, “Going Native, Going Global: The Violin in Modern Japan,” The Asia-Pacific Journal Vol. 12, Issue 48, Number 3 (November 26, 2014)