That so-called "Yosegaki flag" with many autographs was presented to Mr. Isaburo Yoshida from members of Nihon University reunion club organized inside Keio Manufacturing Company. Exact time unknown. That company does not exist today.
Since there are more than 1,020,000 graduates of Nihon University, not knowing how old he was at least, it is difficult to research more details about him so soon.
Wishing aboves to be of any help.