The "original" Gundam, the RX-78-2 design was to be the second unit in a line of eight prototype high-performance assault-type mobile suits. The preceding Gundam model RX-78-1 and the subsequent model RX-78-3 were designed by Okawara between 1980 and 1983 for "Gundam Century" and "Mobile Suit Variations" and the latter appeared in the novel version as the G-3 Gundam after the original Unit 2 was destroyed in battle. The fourth to seventh Gundam is designed by Okawara in 1989 for "Kunio Okawara collection", also known as "M-MSV"(Missing Mobile Suit Variation). Other mechanical designers later added further design variations; including Yutaka Izubuchi's RX-78NT-1, designed in 1989 for the OVA series "", and Shoji Kawamori's and Hajime Katoki's Gundam Development Project designs in 1992 for "Gundam 0083".