VF35+ to me so close to EF it's a toss up really. I don't think it's been messed with in a way that would affect the value. Most coins over 150 years in the USA have had some sort of cleaning. This one looks pretty good. It's a plain 5. Like panzaldi says, acetone, - won't hurt the color (unless it's been added) can't really go wrong, all my two centers get an acetone bath to remove any organic grunge that could be active or corrosive, like PVC residue. No need to rinse, just a swish around and let evaporate. Use pure acetone from the hardware, not nail polish remover.
"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.
See my want page:
http://goccf.com/t/140440