This is the deluxe version of Bryger robot made by Takatoku. This is from the anime called Galaxy Cyclone Bryger that aired circa 1981. This robot transforms into a car (Brysander) and a spaceship (Bryster). It features diecast partial lower legs and clips in the shoulders, and internal parts.
It comes in a large box with an inner cover, and it includes a handle. I believe that the empty slot on the lower left side is for the stickers, which would come rolled up. I have these stored flat.
Here's the car transformation. The arms are removed. The wings are folded down, and the legs compress in and hold on the side panels with chrome exhaust pipes. The front of the car is slipped on over the head, and it latches into the spaces where the arms latched on.
Here's the spaceship transformation. To form the spaceship, the arms are left on. The legs pull down, rotate to the side on diecast bars, and then slide up over the arms. The exhaust piece is slipped over the knee caps. The shins are rotated out to form wings and small fins hidden underneath are raised. The nose cap is slipped over the head, but this time it latches into small cavities in the shoulders.