Here is a Diaclone toy that never saw production. It was originally intended as part of a second line of Baku-Ten, or Attack Robos.
Clearly resembling what would eventually become Starscream for the Transformers line, this hand-sculpted mock-up prototype is made of wood. The head is a wax casting of "Sideswipe's".
The prototype does not Transform, but much like the Diaclone attack robos, was originally intended to have a pullback 'Dasher' feature which, once released, would propel the toy forward causing it to Transform automatically.
A supremely cool piece which sadly never saw the light of day.