Here is the Overstreet grading guidelines for VF/NM:

An exceptional copy with outstanding eye appeal. Sharp, bright and clean with supple pages. Pages and covers can be yellowish/tannish (at the most), but not brown, and will often be off white to white. Light spine wear is acceptable. A comic falls into this condition range if it meets all the following standards:

• Browning of Paper: No browning is acceptable except for older comics--generally those with cover prices 20c or older. Even then, only a modest color change is acceptable.
• Centerfold: Must be fully and properly attached to staples. 
• Corner Bends: Slightly noticeable allowed. 
• Cover Detached at Top or Bottom Staple: Reduces an otherwise VF copy to VG. 
• Distributor's Date Notation: A distributor's date stamp or a date written in pencil or ink, if it is unobtrusive and does not not significantly detract from the overall attractiveness of the comic, is acceptable and is in fact valued by many collectors (as do we) who view distributor date notations as an interesting part of the comic's history. NOTE: Date stamps typically are found on pre-1980's comics. 
• Cover Scuff Marks: Only allowed if very limited and hardly noticeable. 
• Fingerprints: If they can be seen, condition drops to Fine or Very Good. 
• Off-Center Printing: Acceptable if only to a minor degree. 
• Pieces Missing: No pieces missing except for tips of pages nicked during the production process. Note that we include "Marvel chipping" under this definition, a phenomenon well known to the collectors of early 1960's Marvel comics. 
• Rolled Spine: None. 
• Rubber Stamp Imprints: None on cover or inside. 
• Spine Stress Marks: Slightly noticeable allowed. 
• Staples: May be a bit loose, but must be clean, centered with no rust. 
• Subscription Crease/Fold: None. 
• Tape: None of any type. 
• Tears: None 
• Water Stains: None. 
• Writing: No writing except for autographs. Very minor pencil note on interior OK such as a seller's old pricing.

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We were the largest independent retailer of McFarlane Amazing Spider-man, Spider-man, and Spawn comic books.   If you have a SPAWN #1 comic look on the 5th page and you will see our old full page add (Spiders Web, inc). We still have, arguably, the largest back issue supply in the nation!!!