In the case of Monjo which were issued by Samurai families, they were leagally-effective if they contained the issures' signatures or Kao (written seal mark) even if the monjo themselves were written by Yuhitsu.
武家が発給した文書の場合、文書作成そのものが右筆によるものでも署名・花押が発給者当人のものであれば、自筆文書と同じ法的効力を持った。