I'm very heavy on watches so was not surprised to find quite a few, although minor, scratches on my Smiths Everest crystal.
I picked up a tube of Polywatch this week and gave it a go this afternoon.
I am totally amazed at what a great job it's done!!! There are a few tiny marks left but these are all but invisible unless you are looking very closely.
My wife has a Smiths 29a that had one small scratch and that's completely gone.
What a fantastic product.