It is the actual final and definitive version of the MSN-001 Delta Gundam, a prototype transformable Mobile Suit that was scrapped in the planning stages and later changed into a high-performance mobile suit. Vestiges of this can be seen in the flexible binders behind the Hyaku Shiki.
The Hyaku was severely damaged in battle during the final duel of Haman Karn (in her Qubeley) and Quattro Bajeena. Apparently destroyed after Haman defeats Quattro, its wreckage is later shown floating in space (with its cockpit hatch open), implying Quattro's survival of the encounter. The repaired MS later appears in Gundam ZZ as part of the Argama's Gundam Team where it is operated mostly by Beecha Oleg and Mondo Agake.
