Moon Ship is one of the four skins released under the Dawn of the Empire offer. It could be individually purchased with game coins in December 2016.
Moon Ship could be purchased in the Skins Shop under the ‘Space Battle’ tab for 2900 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this skin can vary depending on location, platform or time.
Note: The Dawn of the Empire offer with the Moon Ship skin was released again for a limited time in mid March 2019. The price for Moon Ship remained the same at 2900 coins.