Subseries consists of 98 issues from Old Sleuth Weekly.
Publisher: Arthur Westbrook
Date of First Issue (No. 1): Apr. 17, 1908 Date of Last Issue (No. 203): May 17, 1912
First in Collection (No. 1): Apr. 17, 1908 Last in Collection (No. 172): 1911
Old Sleuth Weekly follows a varied publication schedule: bi-monthly and weekly. The format is 8 x 11 inches with 32 pages. Issues cost 5 cents. Pictorial covers are coloured. All novels are signed by Old Sleuth; they consist primarily of detective stories reprinted from the OS Library, with some new stories.