Their really isn't too many difficult dates and/or mintmarks that are difficult to find. So here is a short list of what is a little tougher. Not impossible mind you, but a little more difficult. 1888-O Double Die (in grades of XF and higher) 1889-CC (in grades of MS-63 and higher) 1893-P (in grades of AU and higher) 1893-S (in grades of XF and better) 1895-P (all grades) 1895-S (in grades of MS-60 and higher) 1901-P (in grades of MS-60 and higher) 1901-P double die (all grades) Other than that, any date mintmark combonation is pretty easy to find at a medium to large show.
i'm gonna get the pictures on here as soon as i can get a good picture that doesn't make the coin look really weird i've been told that taking pictures of your coins takes alot of time a patience which i have neither of so.....it might be a while ~Josh~