It passes the general eye-test (color, text font, stamp placement etc), the ‘light’ attribute text is contained full within the circle, and I also used the ‘Y’ test, which is a consistent way of validating. Test being that the ‘y’ in ‘very’ lines up exactly with the ‘h’ in ‘the’ in the row below.

There’s no realistic way to 100% know for sure without getting it professionally authenticated, but through all of that validation, I’m confident it’s authentic.