I use The VJM Record Grading System for 78s. Listen tested.  Some records can look bad but still have bright / strong sound.

N. As new and un-played (there are virtually no 78s that can categorically be claimed to be un-played).

N-. Nearly Mint, but has been played. No visible signs of wear or damage.

E+. Plays like new, with very, very few signs of handling, such as tiny scuffs from being slipped in and out of jackets.

E. Still very shiny, near new looking, with no visible signs of wear, but a few inaudible scuffs and scratches.

E-. Still shiny but without the luster of a new record, few light scratches.

V+. An average condition 78 in which scuffs and general use has dulled the finish somewhat. Wear is moderate but playing is generally free from distortion. Surface noise not overly pronounced

V. Moderate, even wear throughout, but still very playable. Surface noise and scratches audible but not intrusive.

V-. Quite playable still, but distortion and heavy greying in loud passages. Music remains loud in most passages. Surface noise and scratches well below music level.