This issue is a variant of Wonder Woman (DC, 1987 series) #0 [Direct Sales]. There exist further variants.
As a Zero Hour issue, Wonder Woman's origin in this issue has discrepancies from Wonder Woman (DC, 1987 series) #1. Here, it is Steve Trevor crashing on Themyscira which instigates the contest, whereas in WW #1, Diana already won the contest when he arrives. Additionally, Diana wears the "Mask of Proteus" to disguise her identity during the contest.
Mala notes that Diana's "goddess-given powers did not manifest on Themyscira."