1990 HG (High Grade) grade appeared

1990 — HG (High Grade) debuts. 1/144 high-quality line. Still the base grade with the most kits.

Gunpla internal frame runner — Gunpla internal frame runner — Gravis · CC BY-SA 4.0

Gunpla runner arrangement — Gunpla runner arrangement — Gravis · CC BY-SA 4.0

Gunpla exterior panel runner — Gunpla exterior panel runner — Gravis · CC BY-SA 4.0

1990 — HG (High Grade) debuts — 1990 — HG (High Grade) debuts — GUN_DATA infographic

1990 timeline position — 1990 timeline position — GUN_DATA infographic

Cumulative number of Gundam works as of 1990 — Cumulative number of Gundam works as of 1990 — GUN_DATA infographic

1/144 high-quality line. Still the base grade with the most kits.