Birch, McDonald. Two Large Birch Posters. Mason City: Central Show Printing Co., ca. 1930s. Includes poster featuring the illusionist’s “Sensational Vanishing Pony” trick, and an uncredited poster featuring the Indian Rope Trick, “Solved at Last”. Xylophonist Mabel Sperry is also advertised. 41 x 28” and approx. 57 x 42”, respectively. Both with visible staining and restoration marks, tears at folds, but colors vibrant. C.