I could see the argument for low-mid AU. Looking at it again, the fields show very few marks, strike weakness and worn dies instead of wear at the high points. I'm guessing this looks more apparent in hand.
That said, I can't see any higher than AU53, 55 on a good day with more luster apparent in hand. AU58 seems pretty generous. I can't see this selling for 58 money. Not much spread in price from AU50-55, bit of a jump at 58.