What the condition grades mean
Every item is checked against the light before it goes online. Descriptions err on the harsh side rather than the flattering one.
Mint
Unused, in the original factory packaging. Blister unopened or opened only to photograph it.
Excellent
Glass free of scratches, fungus and separation. Coatings intact, aperture blades dry, focus and aperture rings move evenly. Cosmetic marks minimal or none.
Used
Fully working and optically clean, but the body shows its age: paint wear, brassing, rubbed markings. None of it shows up in the photographs.
Not tested
Sold as seen, because I could not verify it: no battery for that meter, no film back, or a fault I can see but cannot fix. The specific unknown is always named in the listing and the price reflects it.
Two flags that sit on top
Tested means I put the item through its paces and it worked: every shutter speed fired, every ring moved, the meter agreed with a reference. Collector's item marks a piece worth having for what it is rather than what it does. Both are independent of the letter grade, so a Used (B) body can still be tested and working.
What I always mention
Fungus, haze, separation, oil on the aperture blades, a dented filter thread and a sticky focus helicoid. If the description does not mention them, they are not there.