Publication date and price from listings in "Publications of the Week", The Spectator 1908-05-09 p756, and "This Week's Books", Saturday Review -05-23 p670.
Publisher advertisements in the weekly Saturday Review, Everett & Co.'s New and Forthcoming Publications" (which may not be weekly), show a sublist "New Six-Shilling Novels". In the issue dated 1908-02-08, this one is listed there, as forthcoming in March. It's listed in multiple May issues without comment.
