Godzilla was their first kit devoted to a Japanese monster, as opposed to the classic American monsters such as Frankenstein and Dracula. The only other two Japanese daikaiju (giant monsters) which had kits devoted to them by Aurora during that time were Rodan and Ghidrah.
This would be one of the very few American Godzilla toys dating from the introduction of the character to the late 1970's, when the Shogun Warriors Godzilla toy was released. The reason for this was that the Japanese monster movies had limited distribution in the States for several years; the films would be syndicated to television in the 70's, but this was often concentrated upon target markets like Hawaii or Los Angeles.
The Godzilla model exists in both regular and partially glow-in-the-dark versions, as seen here.
Polar Lights would reissue this kit in the 1990's, providing an affordable alternative to buying an original Aurora issue.