Schlunegger's Four Inside Wall Production Box. Pittsburgh: R. Schlunegger, ca. 1932. Short metal tube is shown empty, yet silk handkerchiefs are produced from within. Precision made brass prop conceals four secret internal panels to hold loads; each is opened by a concealed button on the exterior of the tube, and each panel locks when closed. Modernistic painted finish. 3 ½ x 3 ½ x 4 ¼". From the Circus Museum of Sarasota collection and retaining its painted inventory number; purchased by Charles Larson from Schlunegger in June 1932 and accompanied by Larson's handwritten note explaining the apparatus. RARE. One of perhaps 12 manufactured. Schlunegger also built a larger model.