Looks definitely AU53 minimum, the scratch will hurt it but the surfaces seem strange to me, almost acid etched, or corrosion without the corrosion showing, like it was removed. Could be over-sharpened or harsh lighting in the photo though. A super high grade key Buffalo.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013!
ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
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http://goccf.com/t/140440