I took a real good, slow look at it and before I saw your guess/assessment I came up with the same grade…AU50. I almost said AU53, but the patches of wear on the reverse were rather prominent. That being said, that is a downright nice Trade Dollar even at a AU50…Spark
I’d have to say it’s a XF-40, maybe 45. Too much wear for an AU grade. It is very nice and no chop marks.
Sure, it does look like wear at first on the reverse, but how do you handle a coin and only wear one of the two sides you are touching? So I agree with this being a strike issue and go with MS62 rather than the AU53 I first thought.