but anything short of a direct hit with a tool to the face will incur cosmetic damage at worst.
Try a 4 lb shop hammer directly to the face of a casio g shoc , scratched it but only , now this damn near BROKE my arm , I once saw a tug boat mechanic with a g shock that he had welded accross the face it still worked , Casio Gshocks ROCK I have had 2-3 of them in 20 years , they ALWAYS died a HARD death !!!!!! ( well exept for that one that the girl at walmart KILLED while trying to change the battery )
Look here ,
http://www.countycomm.com/Watches.htm
They may have something for you.