From The Overstreet Comic Book Price Guide

Near Mint: Nearly perfect with only minor imperfections. Minor feathering that does not distract from the overall beauty of an otherwise higher grade copy is acceptable for this grade. The overall look is “as if it were just purchased and read once or twice”. Cover is flat with no surface wear. Inks are bright with high reflectivity. No staple tears are allowed; almost no stress lines. Paper is cream to off-white, supple and fresh.

FINE: An above average copy that shows minor wear but is still relatively flat and clean with no significant creasing or other serious defects. Minor cover wear apparent, with minor to moderate creases. A minor spine roll is allowed. Staples show minor discoloration. Minor staple tears and an accumulation of stress lines may be present, as well as minor rust migration. Paper is brown to tan and is fairly supple with no signs of brittleness. Minor interior tears at the margin may be present.

GOOD: Shows substantial wear, often considered a “reading copy”. Cover shows significant wear. Staples may be degraded, replaced or missing. Moderate staple tears and stress lines may be present, as well as rust migration. Paper is brown but not brittle. Moderate interior tears may be present.