The Golden Key

Audience varies The 1890 edition, unillustrated, is the earliest edition found in WorldCat library records and newspapers 2017-04-17.   At the time of its publication by D. Lothrop of Boston the story was used in literature class at Wellesley College, reported The Sun (Baltimore) 1890-11-27 p3. (Not found in The Boston Globe 1890.)   The 2016 edition (which has been given a separate title record) is promoted as Ages 9-11 by the publisher; reviewed negatively for children and labeled "(Illustrated fairy tale. 9-11, adult)", Kirkus Reviews 2016-08-15. The 2016 edition for example was marketed as for ages 9-11

New edition (earliest found in WorldCat library records 2017-04-17)

Publ date inferred from listing SF Chronicle 1890-11-23 p7 "New Books Received" (no price) And notice The Sun (Baltimore) -11-27 p3 "New Publications" (no price): "... attractive booklet form. The tale is used in the literature class of Wellesley College."

Boston: Lothrop, 72 pages, 17 cm --agree all three WorldCat library records, {{OCLC|12698926}} (as "[1886?]"), {{OCLC|607921049}} (as "[18--?]"), and {{OCLC|501174758}} (as "[19--]")