Generally, other than the UNC grade, you will encounter differing opinions on what constitutes Good thru AU notes. The Europeans tend to have stricter standards than their U.S. counterparts, while Modern U.S. currency collectors have a slightly different standard than those that collect Confederate or Obsolete banknotes. Even within a given field, it is hard to get 2 collectors to agree on a grade. The following grading standards are the ones that I follow and basically reflect the guidlines used by noted Confederate and Southern States currency experts Arlie Slabaugh and the late Col. Grover Criswell. The paper is clean and crisp.
Corners are sharp and square, without any evidence of rounding.
Most Confederate and obsolete currency may have uneven margins due to having been cut from the original sheets by hand. May show very slight evidence of bank counting folds or crinkles at a corner or one light fold through the center, but not both. Corners are not rounded. A note that has seen light handling. It may have a maximum of 3 light folds or 1 strong crease.