Publ date (inferred) and price from publisher advertisement "The Latest Books" NY Times 1912-09-15 pBR503
-- "$1.25 net. Postage 13c extra."
-- ("$1.25 net. Postpaid, $1.33" in a later listing)
That is the earliest hit found 2018-08-15 in automated search of multiple newspapers. Another hit is the very long "Announcement List of Fall Books" in semi-monthly The Dial 1912-09-16, covering announcements for Fall and Winter 1912/13.
WorldCat library OCLC 3781145 reports (c)1911, 19cm.
{{OCLC|65740931}}, {{OCLC|855296564}}, and (recommended) {{OCLC|56232356}} variously report microfilm copies as 1912, "197-?" (1970s), and 1989; perhaps all in series Victorian Fiction, Reel 397.