This is Kyozan no Saiko, one of the Musha Shichinin-Shu from the SD Sengokuden: Fuurin Kazan Hen, which was serialized in Kodansha's Monthly Comic Bonbon. He is one of the Fuurin Kazan Shitennou (Four Heavenly Kings). It's a snap-fit model that doesn't require glue, making assembly and disassembly easy♬ Box dimensions: 20.5cm x 15.0cm x 5.0cm This product was purchased over thirty years ago, so it's uncertain whether all the original small parts are present. The photos uploaded show everything included. Bandai SD Gundam Gunpla Kyozan no Saiko