I follow these guidelines:
I use discogs.com for LP & Sleeve Grading
I use discogs.com for Market Value & Pricing Recommendations.
I wash all LP's with Spin Clean Record Washer before listing.
I listen to all LP's on a Victrola Record Player with a New Needle prior to listing.

The Moody Blues – Octave

Label:London Records – PS 708
Format:
Vinyl, LP, Album, Terre Haute Pressing
Country:US
Released:1978
Genre:Rock
Style:Classic Rock

Tracklist

A1Steppin' In A Slide Zone
Written-By – John Lodge
5:28
A2Under Moonshine
Written-By – Ray Thomas
5:00
A3Had To Fall In Love
Written-By – Justin Hayward
3:38
A4I'll Be Level With You
Written-By – Graeme Edge
3:47
A5Driftwood
Written-By – Justin Hayward
5:02
B1Top Rank Suite
Written-By – Justin Hayward
3:40
B2I'm Your Man
Written-By – Ray Thomas
4:20
B3Survival
Written-By – John Lodge
4:09
B4One Step Into The Light
Written-By – Michael Pinder*
4:28
B5The Day We Meet Again
Written-By – Justin Hayward
6:18

Companies, etc.