A Military communications sos telegraph device....long straps to accomodate all size arms and legs ......manufactured by the J.H. Bunnell co.new york.i'm pricing this item after some mild cyber-research ......cant remember aquisition so unwilling to price high......but i dont think this piece is scarce.....its difficult to time frame   this item without specific military knowledge.....so i'm posting poss.WW11.....more likley the korea conflict to vietnam......THANKS