That's a
very nice example of
1995P-1DO-001. For these LMC DDOs, the EDS coins command the highest prices. Judging by the die markers above LIBERTY, yours is an MDS, but a nicely struck example...wherever it falls in MS. Fortunately, the 2007 Redbook isn't very accurate as to recent market trends, as those prices were current for 2006. When I priced this variety a few months back, PCGS MS64+
were selling for over $100 (update: prices at auction seem to have dropped). As to rarity, I recall the run per LMC "business strike" die pairs is around 200,000 coins for this period, but sometimes far fewer coins surface due to the run cut short--the 1969-S DDO is one example. Contrast that to rarities for recent LMC proof varieties, where die runs are limited to 2,000 coins. I know all these details because I found the proof 1999-S Close AM.
Did you find this unattributed? Very nice pick up! As to slabbing, I think it depends on whether you collect slabbed coins. But if you were to sell over the next year, a PCGS/NGC slab would definitely help. When the TPGs slab these, they don't note die state or strike, so collectors will pay the same for a PCGS/NGC EDS MS65 or an MDS MS65.
