The following standards were set forth by the GunBroker.com and others for describing the condition of antique firearms. Again, these standards are very similar to the official NRA Antique Firearm condition standards. The NRA officially calls these their Condition Standards for Antique Firearms.
New - all original parts; 100% original finish; in perfect condition in every respect, inside and out.
Excellent - all original parts; over 80% original finish; sharp lettering, numerals and design on metal and wood; virtually unmarred wood; fine bore.
Fine - all original parts; 30% to 80% original finish; sharp lettering, numerals and design on metal and wood; minor handling marks in wood, good bore.
Very Good - all original parts; none to 30% original finish; original metal surfaces smooth with all edges sharp; clear lettering, numerals and design on metal; wood slightly scratched or bruised; bore disregarded for collectors firearms.
Good - some minor replacement parts; metal smoothly rusted or lightly pitted in places, cleaned or reblued; principal lettering, numerals and design on metal legible; wood refinished, scratched, bruised or minor cracks repaired; in good working order.
Fair - some major parts replaced; minor replacement parts may be required; metal rusted, may be lightly pitted all over, vigorously cleaned or reblued; rounded edges of metal and wood; principal lettering, numerals and design on metal partly obliterated; wood scratched, bruised, cracked or repaired where broken; in fair working order or can be easily repaired and placed in working order.
Poor - major and minor parts replaced; major replacement parts required and extensive restoration needed; metal deeply pitted; principal lettering, numerals and design obliterated; wood badly scratched, bruised, cracked or broken; mechanically inoperative; generally undesirable as a collectors firearm.