Early printings have no number on the spine.
from Four Color (Dell, 1942 series) #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #131 (December 1946), #146 (May 1947), #146 (May 1947), #146 (May 1947), #146 (May 1947), #146 (May 1947), #146 (May 1947), #158 (August 1947), #158 (August 1947), #158 (August 1947) [[nn]], #158 (August 1947) [[nn]], #158 (August 1947) [[nn]]