The auction page can be viewed by clicking here. Here's what the seller, senuseret72, has to say about the history of this peculiar item:
This auction is for a very rare Transformers Gen 1 Starscream prototype. This piece was painted in-house at Hasbro by a designer as consideration for the G2 line. The most likely proposal for this piece was a Jungle Attack Starscream and while not accepted, this piece remains unproduced. This is a production version G1 Starscream that has been redecorated internally at Hasbro for purposes of progressing the line.
This piece is a production version G1 Starscream that has been redecorated internally at Hasbro by a designer in consideration for the G2 line. The proposal most likely would have been for a Jungle Attack Starscream however this particular concept was not accepted and remains unreleased. Proposals are given at line meetings where decisions are made in which direction to take the line. This piece was more than likely created for a line meeting and never made it past that stage of development. The additional Starscream was found with the Jungle Deco Starscream and so they are being auctioned together. Purchased directly from a former Hasbro employee, the provenance is direct.
That is just Pri... I mean, 
I can't remember if I ever toyed with the idea of a fan-fic character with such a paint scheme. I am not sure but I wouldn't be surprised because the concept 