There is a company called Classic Data, I think its German but not sure.
They have a very good and accepted description of conditions, from 1 (perfect) to 5 (basket case/wreck)
Somewhere I have also the pictures that illustrate their description, but not able to find it.
from this page:
classic-data.de/ueber-class … andsnoten/
translated:
Condition 1
Perfect condition. No defects, damages or signs of use on the technology and the optics. Completely and perfectly restored top-class vehicle. Like new (or better*). Very rare.
A vehicle that one approaches enthusiastically and where no defects are found even after close inspection. The basis for the evaluation in condition grade 1 is the assumed condition at first delivery, i.e. the former new car condition of the respective manufacturer.
(I would add that a car that is driven for some miles passes inmediately from “1” to “1-”)
Condition 2
Good condition. Free of defects, but with slight (!) traces of use. Either rare, good unrestored original condition or professionally restored. Technically and optically perfect with slight signs of wear.
A vehicle which is enthusiastically approached, but on closer inspection shows slight signs of use. These slight signs of use should be reflected in the comprehensible, low overall mileage or mileage after restoration. The degree of wear and tear of the technology is correspondingly low.
Condition 3
Used condition. Vehicles without major technical and optical defects, fully roadworthy and roadworthy. No rusting through. No immediate work necessary.
A vehicle you approach and on closer inspection you will easily see traces of use and various minor defects. The traces of use and defects should be reflected in the comprehensible total mileage or mileage after a restoration. The degree of wear and tear of the technology is corresponding to this.
Condition 4
Used condition. Only limited roadworthiness. Immediate work for successful acceptance to MOT is necessary. Light to medium rusting through. Vehicle complete, in individual assembly groups but not necessarily undamaged.
A vehicle that is approached and where various defects are visible from a distance. A closer inspection shows clear signs of wear
Condition 5
Condition in need of restoration. Vehicles in a defective, unroadworthy overall condition. Extensive work required in all assemblies. Vehicle not necessarily complete.
A vehicle in which even the layman immediately recognizes clear defects and/or missing parts. Could also be used as a parts carrier.