It is modeled after the crown excavated from Cheonmachong.
Cheonmachong, formerly Tomb No.155 in South Korea, is a tumulus located in Gyeongju, South Korea. The name Cheonmachong means Sky horse tomb. This tomb was built in the style of Silla. The tomb was for an unknown king of the Silla Kingdom (BC57~935). (source from WIKIPEDIA)