I continually see early mono LP records advertised on eBay with the "explantion" that there is "some surface noise due to early pressing".
This is complete nonsense. If the record is NM or Excellent (Goldmine Grading), then the surface should be silent. If it is not silent, then the record is not NM, nor excellent. It is worn, and has been abused. Some of the very best recordings are on the earliest mono pressings, with completely silent surfaces. Collectors are obsessed with Decca SXL, for example, where the quality of the recording is completely inferior to the earlier mono LXT pressings.