Here is the drawing that ends 2017: fittingly, it's Optimus Prime as well, but as an Action Master. He came with the Armored Convoy truck playset - an enormous truck that Optimus Prime drives. The cab, which sits an Action Master figure, turns into a space jet, while the trailer turns into an elaborate battle station. It was available in 1990, and marks the last of the US Generation One toys.
An Online Amateur Sketchpad