the originality of apple watch series 6?

1. • Find the serial number on your Apple Watch.
2. Enter the serial number at https://checkcoverage.apple.com/

If you bought the Watch from Apple or an Apple Authorised Reseller, then it will be a genuine device.

You can enter the serial number here, Check Your Service and Support Coverage - Apple Support and if it returns a date, it should be a genuine product.

Did you purchase this Watch from a questionable source that would make you question if it was genuine?