This coin was formerly in an NGC AU55 holder and it had a CAC sticker; it was "downcrossed" to a PCGS AU53 where it now looks pretty undergraded to me! The surfaces are very deeply toned in rich green-gold shades and this is one of the few circulated 1857-O quarter eagles that I can recall with such original surfaces. This is the final year of issue for quarter eagles from this mint and the 1857-O, while not really scarce, is extremely hard to find with this appearance.
This is the only CAC AU53 example of this date; thirteen graded higher have been apporved.
From the RYK Collection.