Erm my Skydive has the same stamp as your first one Hasbro 85, takara 85, japan. But having owned KOs of the aerialbots before back in Phils, I would say that i have not known a KO to have metal chests. They are all plastic AFAIK. Must be a later issued variant... not 100% sure though. But yeah KOs= no metal chest at all.