It appears that DuPont No. 93 became DuPont Oval by at least October 1924

[Linked Image from photos.smugmug.com]

Introduction in the November 1924 DuPont Magazine
(you'll need to cut & paste the link)
https://digital.hagley.org/1924_18_11?solr_nav%5Bid%5D=4f8725dc3d15a407f4ba&solr_nav%5Bpage%5D=0&solr_nav%5Boffset%5D=2#page/2/mode/2up


This Super Fox ad appeared in the October 1924 Outdoor Life, and does not attributing the pattern results to Capt. Askins
https://archive.org/details/sim_outdoor-life_1924-10_54_4/page/292/mode/2up

[Linked Image from photos.smugmug.com]