Cassell's Magazine.  June 1912 through January 1913, with an extra episode in August 1913.

London: Cassell, 1914. Bound in red cloth, publishing date printed on title page.
Second impression, 1925.
Third impression, August, 1928. Blue Cloth.
Cheap Edition, 1932.
Eighth Edition, December, 1933.

New York: Bookfinger, 1967. The first American Edition from Bookfinger.

Despite its popularity and numerous British editions, this title wasn't published in the United States until Bookfinger (Joseph G. Amadeo) published it in a very limited edition.