The date of establishment mentioned above, however, is when the group went through the official procedure to have a legislative bargaining position in the Diet; in fact, the gathering had already existed as a social group by the beginning of the year ("Takashi HARA Diary").
ただし、上記の設立日は院内交渉団体として届出があった日であり、実際には遅くても同年初めには親睦団体として存在していた（『原敬日記』）。