MG MSZ-006A1 Zeta Plus A1 Test Color 1/100 (Gundam Sentinel)

Zeta Gundam was broadcast on Japanese TV during '84/85, following up the original series with a whole new set of characters and machines. Not surprisingly, the robot of the same name was the main piece of hardware in the show.
This new show also introduced the "transformation" concept to Gundam, and the Zeta does an impressive one, switching from robot mode to "Wave Rider" mode in the wink of an eye. Perhaps more impressive is the fact the this Master Grade kit can also make this transformation without a single piece having to be removed or replaced on it (not counting the shield/nose piece, but that's true to the show).

This version of the 1/100 MG Zeta Gundam is the test version as it appeared at Anaheim Electronics during the initial phases of the project.