add too this.. I might be wrong about the 51, but I don't think so, but even if i am is a much nicer 51 then the one I presently have (or at least it will be after it's VC bath lol)
The 1851 has wonderful details and I’d pay $20 for Braided Hair LCs like those all day long. Unfortunately it’s not a 51/81 - only one obverse die struck 51/81s, and the date position on that die is farther left than on your coin. Note the position of the first 1 relative to tip of bust, and position of the 8 relative to the hair curl. Looks like you’ve got N-5 for 1851, which is an R-3. 1842 is N-2, R-1. Keep looking!