The Japanese version of this figure featured the sum total number of Grimlock's tech spec imprinted on his back as opposed to the ID number of the American version.
This figure was available in
1986-1987, packaged with any one of the Aerialbots, Stunticons, Protectobots, Combaticons, Technobots, Terrorcons, or Throttlebots.
This figure was available in as part of the Cybertron Hero Collection 9 in Japan in 1986. Additionally, the decoy figures were sold in a multitude of colors via vending machines in Japan; see this article at TFWiki for more details.