Polywatch works well on the watch! I suspect that's because the damage was really light, maybe largely to the coating. Highly recommend giving it a try if you have any light surface
Pollywatch Glass Polish Review - tried removing scratches on an Apple Watch Series 4 - YouTube
Polywatch Watch Cleaner - Wristbuddys
polyWatch - Watch Protector
How to Repair a Broken or Scratched Apple Watch, or Get a Replacement | Macworld
Is there any what to Remove screen scratches? : r/AppleWatch
Amazon.com: Polywatch Watch Crystal Glass polishing Paste with W5 Wipe Cleaner : Health & Household
Apple Watch screen scratch (top right corner) - any tips? : r/AppleWatch