Here's 2 great albums by Led Zeppelin:
1. Houses Of The Holy - Atlantic label SD 7255 stereo from 1974. Condition of vinyl is VG+. Condition of gatefold cover is VG+ with surface and edge wear, ink mark on back. Condition of labels is VG+. Also includes inner sleeve with lyrics. Goldmine Record Album Guide values this album at $15.00 NM.
2. In Though The Out Door - Swan Song label SS 16002 (with "D" on Spine) stereo from 1979 Includes original outer brown paper bag, VG+ condition. Condition of vinyl is VG+, one slight scratch, side 1, not affecting play. Condition of cover is VG+, slight edge wear, some wrinkling open edge. Condition of labels is NM. Includes custom inner sleeve. Goldmine Record Album Guide values this album at $30.00 NM, PLUS 50% more for brown paper bag - total $45.00 NM.
I grade record albums as per the Goldmine Record Album grading system. I try to grade conservatively, sometimes I miss things, but not intentionally.

Goldmine Record Album grading system.

 

Mint (M)

Absolutely perfect in every way. Certainly never been played, possibly even still sealed. Should be used sparingly as a grade, if at all.

Near Mint (NM or M-)

The record should show no obvious signs of wear. And of course, the same should be true of any other inserts, such as posters, lyric sleeves and the like. Basically, an LP in near mint condition looks as if you just got it home from a new record store and removed the shrink wrap. Near Mint is the highest price listed in all Goldmine price guides. Anything that exceeds this grade, in the opinion of both buyer and seller, is worth significantly more than the highest Goldmine book value.

Very Good Plus (VG+)

 A Very Good Plus record will show some signs that it was played and otherwise handled by a previous owner who took good care of it. Record surfaces may show some signs of wear and may have slight scuffs or very light scratches that don't affect one's listening experiences. Slight warps that do not affect the sound are "OK". The label may have some ring wear or discoloration, but it should be barely noticeable. The center hole will not have been misshapen by repeated play. Picture sleeves and LP inner sleeves will have some slight wear, lightly turned up corners, or a slight seam split. An LP cover may have slight signs of wear also and may be marred by a cut-out hole, indentation or corner indicating it was taken out of print and sold at a discount. In general, if not for a couple things wrong with it, this would be Near Mint.

Very Good (VG)

 Many of the defects found in a VG+ record will be more pronounced in a VG disc. Surface noise will be evident upon playing, especially in soft passages and during a song's intro and fade, but will not overpower the music otherwise. Groove wear will start to be noticeable, as with light scratches (deep enough to feel with a fingernail) that will affect the sound. Labels may be marred by writing, or have tape or stickers (or their residue) attached. The same will be true of picture sleeves or LP covers. However, it will not have all of these problems at the same time, only two or three of them.

Good (G), Good Plus (G+)

 Good does not mean Bad! A record in Good or Good Plus condition can be put onto a turntable and will play through without skipping. But it will have significant surface noise and scratches and visible groove wear (on a styrene record, the groove will be starting to turn white). A cover or sleeve will have seam splits, especially at the bottom or on the spine. Tape, writing, ring wear or other defects will start to overwhelm the object.

Poor (P), Fair (F)

The record is cracked, badly warped, and won't play through without skipping or repeating. The picture sleeve is water damaged, split on all three seams and heavily marred by wear and writing. The LP cover barely keeps the LP inside it. Inner sleeves are fully seam split, crinkled, and written upon