We have a revolving section of used and refurbished straights and DE (double edge) razors. Used and vintage straights and DE will usually show some signs of wear, patina, and/or tarnish. We try to show off each item as it really is. Conditions are rated as such:

Like New = near mint or like new condition with minimal to no wear, patina, or tarnish. Could also be fully restored.
Excellent = Probably the best rating a vintage item can really get that has not been fully restored. Minimal wear, patina, or tarnish.
Very good = A used, yet well kept item. Expect some wear, patina, or tarnish that would ultimately appear as if you had kept it yourself.
Good = A used, normally kept item. These items have a little more wear and tear than "very good", but otherwise function perfectly despite an aesthetic scar or two. 
Fair = Used, with signs of neglect and/or damage, but otherwise still usable. This is a great starter item. It ain't pretty, but it works.