Indian Service Police Badge,"Rosebud Reservation

This old badge came off of an old horse ranch estate in Santa Rosa California.It came out of the long time collector of Yvonne Selsor.The badge measures 3 1/2 in. point to point approx.It says on the front Indian Service Police Rosebud Reservation.The badge is Brass .T is no maker trademark on the back. This badge has all the appearance of being worn over a long period of time.I am told this badge is 100 % authentic. Good Luck Bidding.