Could be wrong but Grimlock toys have pretty much almost always stuck to red, orange or clear.
Diaclone Grimlock has a silver sword, as well does the KO from back then and the Pre-History KO with the horn on its nose. His G1 box art has silver but as far as I know the toy only came with a red sword.
http://www.fredsworkshop.com/fakedinos.html
http://www.fredsworkshop.com/frames.html
I still function.....................while killing threads. ;-)