Useful Forum Links:
FTF format for vinyl pressings: https://www.discogs.com/forum/thread/368277?page=2#7272545
Variant Grouping: https://www.discogs.com/forum/thread/392356?page=5#7584624
Variant numbering & format: https://www.discogs.com/forum/thread/741352#7584677
Runout groove etchings: https://www.discogs.com/forum/thread/743281

Common guidelines:
Most complete title: RSG §3.1.3
Sub-titles in paranthesis: RSG §3.1.4
Image order: RSG §13.8
One matrix number field: RSG §5.2.c

Vinyl Mastering Deadwax impressions:

Atlantic Studios:
ATLANTIC STUDIOS D.K. (stamped) - Dennis King

Capitol Mastering:
MASTERED BY CAPITOL - typically stamped followed by below etchings:
Dave or DCM - Dave McEowen
E or ES - Eddy Schreyer (Also Oasis Mastering)
Gene or ƐRT - Gene Thompson
Jay Luck, Jay, Jay☒ - Jay Maynard
KEV - Kevin Reeves
KP - Ken Perry
IS (May look like H with I inside) - Ian Sefchick
McM or RM - Ron McMaster
Wally or Wly - Wally Traugott

Masterdisk:
MASTERDISK - typically stamped followed by etchings:
AD - Alex DeTurk
BK - Bill Kipper
GC - Greg Calbi
GG - Graham Goldman
GK - Gilbert Kong
HW - Howie Weinberg
JD - Jean Dyer
LZ - Leon Zervos
RL - Bob Ludwig
SH - Scott Hull (2)
TD - Tony Dawsey

Sterling Sound:
sᴛᴇʀʟɪɴɢ - typically stamped followed by below etchings:
CA – Chris Athens
GC, ℊc, ☆ or ⚾ - Greg Calbi (Also Record Plant, Masterdisk)
JS or Jack – Jack Skinner
LH – Lee Hulko
RJ – Ray Janos
RKS – Ryan Smith (2)
RL – Bob Ludwig (Also Gateway Mastering)
TC – Tom Coyne (Also Frankford/Wayne, The Hit Factory)
TJ – Ted Jensen

Additional Mastering Engineers scribed in deadwax:
⍺ʙ or Al Brown - Al Brown (5) (Atlantic Studios, Sound Cutting, Inc., Audio Spectrum)
♡POGO - Keith Olsen (Pogologo Productions)
sƒ - Sam Feldman (Atlantic Studios, ℬℯ𝓁𝓁 𝒮ℴ𝓊𝓃𝒹)
⁀⁀ ⁀⁀(birds) or メ or ❀ - Brian Gardner (Allen Zentz Mastering, Bernie Grundman Mastering)
ʙʟ⍂ɪʀ or ʙʟ△ɪʀ - Chris Blair (Abbey Road Studios)
⁄|⁄ǀ⁄|⁄ǀ⁄|⁄K - Randy Kling (Randy's Roost, Disc Mastering, Inc.)
Chet - Chet Bennett (Muscle Shoals Sound, CBS)
Porky or Porky Prime Cut - George Peckham (Apple Studios, Master Room, IBC Studios/Portland Studios, Porky's Mastering)

Vinyl Pressing Plant deadwax markings:
ɑ stamped/etched in runout - Allied Record Company
𝒜ℛP - American Record Pressing Co.
⋐riteriɑ - Criteria Recording Studios
EDP [in oval] - Europadisk
ℰMW - Electrosound Group Midwest, Inc.
回-G-回 - MCA Pressing Plant, Gloversville
◈-P-◈ - MCA Pressing Plant, Pinckneyville
Ƨ, S1, S2, 1S, 2S - Columbia Records Pressing Plant, Santa Maria
Ⓤ (circle u) etched in the runout - United Record Pressing
✲ or ☆ - Capitol Records Pressing Plant, Los Angeles
—◁ - Capitol Records Pressing Plant, Winchester
△ [with IAM inside] or Anvil/Lathe ☖ - Capitol Records Pressing Plant, Scranton

Vinyl Pressing Plant label marks and number codes:
◉ or ✤ at the end of the B side label matrix - Decca Records, Gloversville
◆ at the end of the B side matrix - Decca Records, Pinckneyville
◈ at the end of the B side matrix - Decca Records, Richmond
6 = All Disc Records, Inc.
16 = Sonic Recording Products, Inc. / Goldisc Recording Products, Inc.
18 = Presswell
19 = Bestway Products Inc.
22 = Allied Record Company
24 = Monarch Record Mfg. Co.
25 = Columbia Records Pressing Plant, Santa Maria
26 = PRC Recording Company, Compton, CA
28 = Rainbo Records
30 = Plastic Products
49 = Specialty Records Corporation
53 = Keel Mfg. Corp. (prior to '79); Hauppauge Record Manufacturing Ltd. ('79 and later)
54 = Shelley Products
56 = Columbia Records Pressing Plant, Pitman
60 = Sound Makers
70 = RCA Records Pressing Plant, Indianapolis
72 = PRC Recording Company, Richmond, IN
73 = Columbia Records Pressing Plant, Terre Haute
74 = Electrosound Group Midwest, Inc.
76 = Hub-Servall Record Mfg. Corp.
Number codes from mossinterest

A&M Records label codes
X = Columbia Records Pressing Plant, Pitman
Y or y = Columbia Records Pressing Plant, Terre Haute
Z = Columbia Records Pressing Plant, Santa Maria
W = Columbia Records Pressing Plant, Carrollton, GA
C = Monarch Record Mfg. Co. (pre-1985), Electrosound Los Angeles (1985-86)
B = Electrosound Group Midwest, Inc.
R = RCA Records Pressing Plant, Indianapolis

Vinyl label ST Code Interpretations:
LP label matrix example: (Led Zeppelin I)
ST-A-681461-MO
ST = stereo
A = Atlantic Records label
68 = last two digits of the year Atlantic first received source (tape) and started working on mastering
1461 = tape master number (for side one in this example)
MO = Monarch Records pressing plant
From mossinterest

Vinyl Pressing Plant Letter Label Codes:
AR = Allied Record Co., Inc., Los Angeles, CA
BW = Bestway Plastics, Mountainside NJ
CT or CTH = Columbia Records Pressing Plant, Terre Haute
CP = Columbia (Pitman, NJ)
CS or CSM = Columbia (Santa Maria, CA; very infrequently)
FT = Fidelatone Mfg.
LY = Shelley Products, Huntington Station, NY
MG or MGS = MGM Record Mfg. Division, Bloomfield, NJ
MO = Monarch Record Mfg. Co., Los Angeles, CA
PL = Plastic Products, Inc., Memphis, TN
PR = Presswell Records Mfg. Co., Ancora, NJ (they handled most of Atlantic's LP's during much of this period)
RI = Philips Recording Co., Richmond, IN
SO = Southern Plastics
SP = Specialty Records Corp., Olyphant, PA
From mossinterest

CD Matrix Interpretations:

CD Matrix Codes & Logos:
ARC - Pressed by Allied Record Company
SRC - Pressed by Specialty Records Corporation (Without Logo 1986-1992, With Logo 1993 & Later)
ARC and SRC - Pressed by Allied Record Company Glass Mastered at Specialty Records Corporation
CAPITOL JAX, CD JAX, JAX - Manufactured by Capitol Jax
EMI JAX - Manufactured by EMI Jax
wea mfg. OLYPHANT - Glass Mastered at WEA Mfg. Olyphant
"CI" etched in the mirror band but also says "WEA Mfg Olyphant" - Pressed by Cinram, Olyphant, PA, Glass Mastered at WEA Mfg. Olyphant
'wea mfg. Commerce', 'wea mfg. CA' or 'wea CA', Mould SID Code of IFPI 2V** - Pressed by WEA Mfg. Commerce
Mastering SID code of "L901" to "L903", "L908" and "L909" but lacks any mention of WEA Mfg. Olyphant, mould SID code of IFPI 2U** - Matrix start example of X26718, Manufactured by Cinram, Olyphant, PA
Mould SID code of IFPI 2V** - Pressed by Cinram, Commerce, CA
Mould: 6100, Glass master: L384, L385, L388 pressed by Cinram, Richmond, IN - The date of the glass master can be determined from the Cinram matrix number (L385 9611 HS110042 C20429-07 A - Glass master date: 2002-04-29)

Olyphant Company CD Matrix Numbers

"W" mastering (L901):

WEA Mfg. Olyphant
W1-W4xx: approx 1996
W4xx-W20xx: approx 1997
W20xx-W42xx: approx 1998
W42xx-W46xx: approx 1999 (LBR non-operative for a portion of year?)
W46xx-W67xx: approx 2000

---------------------------------------------------------
"X" mastering (L902):

WEA Mfg. Olyphant
X1-X9xx: approx 1996
X10xx-X38xx: approx 1997
X39xx-X65xx: approx 1998
X66xx-X102xx: approx 1999
X103xx-X144xx: approx 2000
X145xx-X171xx: approx 2001
X172xx-X183xx: approx 2002
X186xx-X200xx: approx 2003

Plant sold, now Cinram, Olyphant, PA
X200xx-X203xx: approx 2003
X204xx-X224xx: approx 2004
X224xx-X250xx: approx 2005
X254xx-X278xx: approx 2006
X280xx-X298xx: approx 2007
X299xx-X310xx: approx 2008
X312xx-X332xx: approx 2009
X334xx-X348xx: approx 2010
X349xx-X368xx: approx 2011
X370xx-X384xx: approx 2012
X386xx-X399xx: approx 2013
X400xx-X415xx: approx 2014
X418xx-X42xxx: approx 2015

---------------------------------------------------------
"Y" mastering (L903):

WEA Mfg. Olyphant
Y1-Y6xx: approx 1996
Y7xx-Y31xx: approx 1997
Y32xx-Y61xx: approx 1998
Y61xx-Y102xx: approx 1999
Y100xx-Y146xx: approx 2000
Y147xx-Y179xx: approx 2001
Y179xx-Y207xx: approx 2002
Y209xx-Y220xx: approx 2003

Plant sold, now Cinram, Olyphant, PA
Y220xx-Y221xx: approx 2003
Y221xx-Y228xx: approx 2004
Y231xx-Y24xxx: approx 2005
Y243xx-Y243xx: approx 2006 (need more data)

LBR now L902:
Y248xx-Y250xx: approx 2007
Y25xxx-Y25xxx: approx 2008 (need more data)
Y259xx-Y264xx: approx 2009
Y271xx-Y274xx: approx 2010
Y280xx-Y280xx: approx 2011 (need more data)

---------------------------------------------------------
"Z" mastering (L909):

WEA Mfg. Olyphant
Z00001-Z052xx: approx 2001
Z053xx-Z134xx: approx 2002
Z134xx-Z204xx: approx 2003

Plant sold, now Cinram, Olyphant, PA
Z204xx-Z210xx: approx 2003
Z214xx-Z319xx: approx 2004
Z320xx-Z484xx: approx 2005
Z484xx-Z579xx: approx 2006
Z580xx-Z663xx: approx 2007
Z669xx-Z734xx: approx 2008
Z740xx-Z842xx: approx 2009
Z844xx-Z994xx: approx 2010
Z996xx-Z1084xx: approx 2011
Z1085xx-Z1167xx: approx 2012
Z1172xx-Z1226xx: approx 2013
Z1237xx-Z1318xx: approx 2014
Z1329xx-Z1342xx: approx 2015
From brianvy forum post

CD DID Codes:
Used by Sony's manufacturing company, Digital Audio Disc Corporation Digital Audio Disc Corp., to identify the master copies of CDs duplicated in their pressing plants.
* DIDC - Classical recordings released on Sony-affiliated record labels.
* DIDP - Popular (i.e., non-classical) recordings released on Sony-affiliated record labels.
* DIDX - Recordings pressed by DADC by released on non-Sony-affiliated record labels.
* DIDY - Recordings pressed by the US division of DADC for the Columbia House Record Club.
* DIDZ - Recordings released on WEA Japan. (This code was only used from 1983 to 1985.)
From lazlo_nibble forum post

℗ © ™ ℠ ® RИ ▷ △ ◁ ∇ Δ ◊ ∆ £ ↔ ℒ • · ˙ ⋮ Ψ º ժ Σ ● ⇧ Ⴔ ⚇ ɪ ∞ (ˆ◡ˆ)
𝒜 ℬ ℰ ℯ ℱ ℊ ℋ ℎ ℐ ℒ ℓ ℳ ℴ ℘ ℛ

Arrows:
← ↑ → ↓ ↔ ↕ ↖ ↗ ↘ ↙ ▲ ▼ ◀ ▶ ➔ ➘ ➙ ➚ ➛ ➜ ➝ ➞ ➟ ➠ ➡ ➢ ➣ ➤ ➥ ➦

Encircled:
ⒶⒷⒸⒹⒺⒻⒼⒽⒾⒿⓀⓁⓂⓃⓄⓅⓆⓇⓈⓉⓊⓋⓌⓍⓎⓏ
ⓐⓑⓒⓓⓔⓕⓖⓗⓘⓙⓚⓛⓜⓝⓞⓟⓠⓡⓢⓣⓤⓥⓦⓧⓨⓩ
①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬⑭⑮⑯⑰⑱⑲⑳㉑㉒㉓㉔㉕㉖㉗㉘㉙㉚㉛㉜㉝㉞㉟㊱㊲㊳㊴㊵㊶㊷㊸㊹㊺㊻㊼㊽㊾㊿
➊➋➌➍➎➏➐➑➒➓

Geometric Shapes:
■□▢▣▤▥▦▧▨▩▪▫▬▭▮▯▰▱▲△▴▵▶▷▸▹►▻▼▽▾▿◀◁◂◃◄◅◆◇◈◉◊○◌◍◎● ◐ ◑ ◒ ◓ ◔ ◕ ◖ ◗ ◘ ◙ ◚ ◛ ◜ ◝ ◞ ◟ ◠ ◡ ◢ ◣ ◤ ◥ ◦ ◧ ◨ ◩ ◪ ◫ ◬ ◭ ◮ ◯ ◽ ◾

Greek:
Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω

Letterlike Symbols:
℠ ℡ ™ ℣ ℤ ℥ Ω ℧ ℨ ℩ K Å ℬ ℭ ℮ ℯ ℰ ℱ Ⅎ ℳ ℴ ℵ ℶ ℷ ℸ ⅍ ⅎ

Number Forms:
Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ Ⅼ Ⅽ Ⅾ Ⅿ ⅰ ⅱ ⅲ ⅳ ⅴ ⅵ ⅶ ⅷ ⅸ ⅹ ⅺ ⅻ ⅼ ⅽ ⅾ ⅿ ↀ ↁ ↂ

Phonetic Extensions:
ᴀ ᴁ ᴂ ᴃ ᴄ ᴅ ᴆ ᴇ ᴈ ᴉ ᴊ ᴋ ᴌ ᴍ ᴎ ᴏ ᴐ ᴑ ᴒ ᴓ ᴔ ᴕ ᴖ ᴗ ᴘ ᴙ ᴚ ᴛ ᴜ ᴝ ᴞ ᴟ ᴠ ᴡ ᴢ ᴣ ᴤ ᴥ ᴦ ᴧ ᴨ ᴩ ᴪ ᴫ ᴬ ᴭ ᴮ ᴯ ᴰ ᴱ ᴲ ᴳ ᴴ ᴵ ᴶ ᴷ ᴸ ᴹ ᴺ ᴻ ᴼ ᴽ ᴾ ᴿ ᵀ ᵁ ᵂ ᵃ ᵄ ᵅ ᵆ ᵇ ᵈ ᵉ ᵊ ᵋ ᵌ ᵍ ᵎ ᵏ ᵐ ᵑ ᵒ ᵓ ᵔ ᵕ ᵖ ᵗ ᵘ ᵙ ᵚ ᵛ ᵜ ᵝ ᵞ ᵟ ᵠ ᵡ ᵢ ᵣ ᵤ ᵥ ᵦ ᵧ ᵨ ᵩ ᵪ ᵫ ᵬ ᵭ ᵮ ᵯ ᵰ ᵱ ᵲ ᵳ ᵴ ᵵ ᵶ ᵷ ᵸ ᵹ ᵺ ᵻ ᵼ ᵽ ᵾ ᵿ ᶀ ᶁ ᶂ ᶃ ᶄ ᶅ ᶆ ᶇ ᶈ ᶉ ᶊ ᶋ ᶌ ᶍ ᶎ ᶏ ᶐ ᶑ ᶒ ᶓ ᶔ ᶕ ᶖ ᶗ ᶘ ᶙ ᶚ ᶛ ᶜ ᶝ ᶞ ᶟ ᶠ ᶡ ᶢ ᶣ ᶤ ᶥ ᶦ ᶧ ᶨ ᶩ ᶪ ᶫ ᶬ ᶭ ᶮ ᶯ ᶰ ᶱ ᶲ ᶳ ᶴ ᶵ ᶶ ᶷ ᶸ ᶹ ᶺ ᶻ ᶼ ᶽ ᶾ ᶿ

Special:
« » ❝ ❞ × ⦂ ⁃ ‐ ‑ ‒ � – ⎯ — ― ~ • ° % ‰ ‱ & § ÷ ± ‼ ¡ ¿ ⁇ ⁉ ⁈ ‽ ¼ ½ ¾ ² ³ ⅕ ⅙ ⅛ ℅ ℁ ⅍ ¶ ≠ √ ∛ ∜ ∞ β Φ Σ € ₤

Stars:
★ ☆ ✪ ✫ ✯ ✡ ⚝ ⚹ ✵ ❉ ❋ ✺ ✹ ✸ ✶ ✷ ✵ ✴ ✳ ✲ ✱ ✧ ✦ ⍟ ⊛ ⁕ ﹡ ❃ ❂ ✼ ✻ ✰ ⍣ ✭ ≛ * ٭

Super & Subscript:
¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ª º ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₀

Underline:
a̲b̲c̲d̲e̲f̲g̲h̲i̲j̲k̲l̲m̲n̲o̲p̲q̲r̲s̲t̲u̲v̲w̲x̲y̲z̲0̲1̲2̲3̲4̲5̲6̲7̲8̲9̲
a̲̲b̲̲c̲̲d̲̲e̲̲f̲̲g̲̲h̲̲i̲̲j̲̲k̲̲l̲̲m̲̲n̲̲o̲̲p̲̲q̲̲r̲̲s̲̲t̲̲u̲̲v̲̲w̲̲x̲̲y̲̲z̲̲0̲̲1̲̲2̲̲3̲̲4̲̲5̲̲6̲̲7̲̲8̲̲9̲̲

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