Bandai Gashapon. The novelty with this gashapon is that the Gundam is packaged within its own head as a sphere. All the parts to complete the Gundam Head is contained in the sphere.  From Mobile Suit Variations (MSV features variations of mobile suits during the One Year War). Assembly instructions (In Japanese)  included.  There are 4 types in this lineup:

[1] RX-78-1 Prototype Float Type Quantum

[2] RX-78-2 Quantum Rollout color

[3] RX-78-2 Gundam Movie Poster Blue Image Color (The movie at that time)

[4] Secret Rare

Assembly Required. Size 4 inches (10 cm) [Completed model]