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.
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]