OK, we all know that stainless steel isn't made all the same, but a visit to the Rolex dealership had me wondering. I was checking out the Submariner and the salesman was telling me how the grade of stainless steel used on the newer watches is higher, tougher and more durable than what's normally used on watches. Not sure if she was BSing. If not, then is this a new stainless steel material that Rolex is implementing (on Subs), and if so, is Omega implementing something similar? I've had a number of stainless steel watches in the past (Omegas but not Rolex) and they've all had scratches from daily wear. Nothing out of the usual. Just wondering if this "higher grade" stainless steel the Rolex salesman claims is more resistant to scratches, or just a marketing gimmick. Or if it's even true.