Grading:
UNC -  Uncancelled, best grading possible
AU -    Almost Uncancelled, very good
EF -     Extremely Fine, very good pieces, but circulated
VF -     Very fine, clearly circulated, some folds, for most  (NOT ALL) of the shares     and bonds this is average grade.
Fair -    Paper is wrinkled and have more spots and folds. Do not belong in a serious      collection unless the paper is very rare.
Poor -   Doesn't belong in ANY collection. 

Note: Additions like + or - mean that offered or shown papers are in a bit better or a bit worse condition than the main condition. ( For example: EF- means that the paper is generally EF, but has a minor disruption, but still can be considered as EF. EF- is more or less the same as VF+.

Please be aware of the fact that most dealers use "optimistic" grading.