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How would a scratch in aluminum be any more or less permenant than if it was in 316L? From my experience aluminum and 316 both finish nicely.
Either way, the screen on my Nike+ ed. is scratched and it hasn't even been a week since I bought it.
The 7000 series aluminum used on the Apple Watch and the 316 L stainless steel used on the stainless model have completely different vulnerabilities.
Once the aluminum on the sport model is scratched or nicked, it's permanent. There is literally no way of removing the damaged area. The screen that is used on the sport model is Ion-X, is primarily the same material used on the iPhone screen.
The stainless model Apple Watch, if you scratch or Nick the casing, it can be buffed out with the polish or polishing cloth. The stainless watch has a sapphire display, which is highly scratch resistant. The 316 L stainless is also much softer metal, where it can easily be scratched, but also can be easily polished within minutes.
And regarding the scratch on your Nike watch, sometimes it doesn't take much to damage the display on the sport model. Some have said it holds up well and others have said it scratches easily. I guess it all depends on what type of material you hit it on. But I can defintely see the scratches from your pictures on the display. That's one of the benefits that I have owning the stainless model is the sapphire display.