It is a Leone 9I or the NGC VP-005 is correct. There are a lot of different 1864LM RPDs I've lost count but at least 20+ different minor RPD varieties. Worth slabbing? Depends on why. for resale? To protect it? You will pay extra to have the variety ID placed on the label so a cost of almost what I would pay for the coin raw, just to slab it it and have the error ID added. Not a good deal financially and not going to make the coin sell for any more value to 98% of the potential buyers IMO. I'd grade it around EF45+ to AU53 range, probably cleaned and might even get a details from a
TPG.
"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