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 1982, EAC Member #6202, NBS Member, 2¢ variety collector.
See my want page: http://goccf.com/t/140440