1850-O = F-15 details, scratched, possibly cleaned. LIBERTY is full and strong, but other details on the coin would not push it into VF territory. 1853 - VG-10 details; lightly corroded, graffitti on the obverse in the form of a small "T." It is possible this is coincidence, and that these are random perpendicular scratches. If that's the case, they are deep enough to merit being called scratched instead of graffitti. 1883 - VF-25 detail, lightly cleaned. 1891 - VF-20 detail; lightly corroded/darkened.
My grades are: VF-20 F-12 VF-30 VF-20 The last two show signs of pitting which could be from corrosion - not really sure.