I have owned the Galaxy watch, 42mm for less than a week, and already have a scratch on the glass. And not a small one, it's pretty deep and noticeable. I have not even worn this outside yet so can't imagine what I scratched it on. I thought these things were supposed to be tough? Is there a screen protector you can get for it? And is this repairable? I'm very particular so this is going to really bug me!!
There are multiple screen protectors out in the market for the watches, and it is best to put them on as it can help you with the cosmetic wear and tear damage. Amazon, walmart, and ebay are some of the stores that carry them online. For a scratch, there is no warranty coverage and if you want to fix that, you would have to replace the screen outright.