According to McKay and Scott, the first appearance of SHE AND ALLAN was as a serialized novel, published in Hutchinson's Story Magazine from July 1919 through March 1920 under the title SHE MEETS ALLAN. Maurice Greiffenhagen created 17 illustrations for the serialization. The serialization was also abridged.
Higgins claims that Hutchinson paid ÂŁ900 ($65,000 in 2020 dollars) for the serial rights, and ÂŁ1000 ($73,000 in 2020 dollars) was advanced for publication in book-form.
I am aware of at least two American newspapers that also serialized this novel. At least one ran from December 7, 1919 through March 28, 1920.
Longmans, Green and Company published the first edition in book-form on January 5, 1921 in New York. McKay and Scott both agree on this publication date. The American edition only has a full-color frontispiece by Enos B. Comstock. The ads at the end of the book are not dated.
McKay, Scott, and Whatmore all claim that Hutchinson and Company published the first British edition in London on February 17, 1921. Only 8 of Greiffenhagen's 17 illustrations are in this edition. There are ads at the end of the book dated Spring 1921. McKay, Scott and Whatmore claim that 8,000 copies were printed.
McClelland and Stewart published the first edition in Canada, likely also in 1921.
See the VisualHaggard.org page dedicated to the illustrations found in various editions.
I own none of this serialization
I also own another un-restored DJ
I also own a second copy with gilt on spine
Spring 1921 on the first page of ads at the end of the book