"Plunket Jr. is about a 1/2 scale model of the 1/2 H.P. Plunket Jr. engine manufactured by the J.E. Plunket Company of Chicago, Illinois around 1909. It was used to power washing machines, sewing machines and other household chores. It is shown on page 395 of 'American Gasoline Engines Since 1872' by C.H. Wendel." - Jerry Howell