Matrix/Runout: 123ABC-1 --> Poor
Matrix/Runout (A): 123ABC-1 --> Fair
Matrix/Runout (Side A): 123ABC-1 --> Good
Matrix/Runout (Runout Side A): 123ABC-1 --> VG
Matrix/Runout (Stamped, Runout Side A): 123ABC-1 --> NM
Matrix/Runout (Etched, Runout Side A): 123ABC-1 --> NM

WG/NRP
Add a company: Mastered at Nashville Record Productions
Add a credit: Mastered By - Wes Garland

GEO/NRP or GEO NRP
Add a company: Mastered at Nashville Record Productions
Add a credit: Mastered By - George Ingram

GOLDEN
Add a company: Mastered At - Golden Mastering
Add a credit: Mastered By - John Golden
JJ = Mastered By - JJ Golden

Mastered By - Kevin Gray
KG @TCS
Add a company: Mastered at The Cutting System, Inc.
KPG@ATM
Add a company: Mastered at AcousTech Mastering
KG@CA
Add a company: Mastered at Cohearent Audio

Side A: xxxxx.1(2) or (3)
Side B: xxxxx.2(2) or (3)
Mastered By - Record Technology Incorporated

STERLING
Add a company: Mastered at Sterling Sound

TML M/S/X
Add a company: Mastered at The Mastering Lab
* The letter after the dash indicates which lathe was used (M = Master, S = Slave, X = Extra)

SLM △
Add a company: Mastered at Sheffield Lab Matrix
Add a note: "SLM △" in the runout etching indicates that the lacquer disc was processed at, and the metal parts used to manufacture the record were made at Sheffield Lab Matrix.

Pressing Plant Information for LPs:
ⓤ = Pressed by United Record Pressing
AL = Allentown Record Co. Inc.
AR = Allied Record Co., Inc., Los Angeles, CA
BW = Bestway Products Inc.
HRM = Hauppauge Record Manufacturing Ltd.
LY = Shelley Products, Huntington Station, NY
MG or MGS = MGM Record Mfg. Division, Bloomfield, NJ
MO = Monarch Record Mfg. Co., Los Angeles, CA
PH = PRC Recording Company, Richmond, IN
PL = Plastic Products, Inc., Memphis, TN
PP = Plastic Products
PR = Presswell Records Mfg. Co., Ancora, NJ
PRC = PRC Recording Company, Richmond, IN
PRC-C or PRC-W = PRC Recording Company, Compton, CA
RI = Philips Recording Co., Richmond, IN
SO = Sonic Recording Products, Holbrook, N
SP = Specialty Records Corp., Olyphant, PA
W = H.V. Waddell Co. (Not on Atlantic Releases)

0 = Capitol Records Pressing Plant, Jacksonville
—◁ = Capitol Records Pressing Plant, Winchester
✲ or ☆ (prior to '64 = Capitol Records Pressing Plant, Los Angeles

◈-P-◈ = MCA Pressing Plant, Pinckneyville
回-G-回 , ⧈-G-⧈ = MCA Pressing Plant, Gloversville

CT or CTH = Columbia Records Pressing Plant, Terre Haute
CP = Columbia (Pitman, NJ)
CS or CSM = Columbia (Santa Maria, CA; very infrequently)
G or G1= Columbia Records Pressing Plant, Carrollton, GA
Ƨ = Columbia Records Pressing Plant, Santa Maria
T, 1T, T1, 2T, T2 = Columbia Records Pressing Plant, Terre Haute

Columbia used PAL and PBL prefixes for side 1 and 2 and A and B suffixes for the Santa Maria, Ca. plant, C and D for Terra Haute, In. and E and F for Pitman N.J. Six (or more) sets of lacquers were usually cut for any big-name artist, so the very first mastering would be 1A,1B,1C,1D,1E,and1F.

93512 1A Cat. # = Pressed By - Record Industry
Current matrix scheme:
##### XY Z
Simple 5 number or 6 1#####
X is the cut number. Often simply a 1, sometimes a 2. In rare cases the cut number may be even higher.
Y is the side identifier, e.g. A, B. On double A side releases, the side identifier will still use "B" for the AA side.
Z is the catalogue number assigned by the label.

S-12345 = Pressed by Rainbo Records

BC781001-01 A1 = Pressed by Optimal Media GmbH

-XXXX- up to -9999- or -XXXXX- starting from -10000- = Pressed By - Pallas

114778E1/A = Pressed By: GZ Media

Other Dead Wax Etchings
AT = Mastered at Atlantic Studios
AT/GP (handwritten) = mastered by George Piros at Atlantic
AT/DK (handwritten) = mastered by Dennis King at Atlantic
ATLANTIC STUDIOS DK (stamped) = mastered by Dennis King at Atlantic
ABS = Alex Sadkin
ab or AB = Abbey Record Mfg. Co. (? we still don't know the exact meaning)
⍺ʙ or aB = Al Brown (5)
BDI or B.D.I. = Brian Ingoldsby
EDP [in oval] = Europadisk Pressing & Mastering
PR or PRC or (PR) = Philips Recording Co. (maker of metal parts from lacquers)
LW or LWP = Longwear Plating (maker of metal parts from lacquers) Enter as "Mastered At"
♡POGO = Keith Olsen's Pogologo, Inc. (Productions)
Porky or Porky Prime Cut = George Peckham
Pecko Duck = George Peckham
sƒ = Sam Feldman
RL = Bob Ludwig
LH = Lee Hulko
"ɑ" looks like Q = Allied Record Company (usually followed by B-XXXXX)
MG = MGM Records Division in Bloomfield, NJ (Pressing)
AMP = ABC-Paramount
M = Mercury
RCA = RCA Victor
RG = Rob Grenell, mastering engineer for Atlantic in the late 60's
GK = Gilbert Kong
"cg" + "☮" = Chris Gehringer
GF = Greg Fulginiti, of Artisan
R3 or R4 = Mastered at Rainbo Records (on Capitol Pressing)
︵︵〰 (birds) or メ or ❀、= Brian Gardner
DT = Dave Travis
RJ = Ray Janos
cB = Chris Bellman
AZ CB = Chris Bellman at Allen Zentz Mastering
JG = John Golden
JJ + GOLDEN = JJ Golden
JJ = John Johnson (3)
SM = Stephen Marcussen
MF = Mike Fuller
BK = Bill Kipper
McM = Ron McMaster at EMI NY
SH = Steve Hall
H.W. = Howie Weinberg
TJ = Ted Jensen
RB = Ron Boustead (Precision)
SG = Steve Guy
Chet = Chet Bennett
RAYS = Ray Staff at Trident Studios, London
TLC = The Lacquer Channel
FW Ѽ or FWNY = Frankford/Wayne Mastering Labs
GOL = Goldisc Recording Products, Inc.
SON or Son = Sonic Recording Products, Inc.
CSB ♪♪ = Carlton Batts (usually with F/W)
TD = Terry Dunavan
ESR = Elektra Sound Recorders
GC or Baseball looking symbol next to Sterling = Greg Calbi
ℰMW = Electrosound Group Midwest, Inc.
WM (W integrated atop M stamp) = Wakefield Manufacturing
⋐riteriɑ = Criteria Studios
ʙʟ⍂ɪʀ or ʙʟ△ɪʀ = Chris Blair (mastering)
dg = David Gold (3) (Gold Star Studios)
HERbiE :^) = Herb Powers Jr. (mastering)
⁄|⁄ǀ⁄|⁄ǀ⁄|⁄K = Randy Kling (mastering)
ℐ⍺ = Jack Adelman

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℗ © ® ⓤ ™ ≠ ∆ TM™ ☮ Ⓟ ® ✴
· • ★ ☆ ✫ ✶ ✻ ✲ ✲ Δ ∇ ▽ ♢ ∴ ∵ ∞ ←↑→↓↔ ↧ »« † ⊠ □ ✱ ◇▼ ✴ ○ ● • ∙ ▽ № Nº ™ ⅓ → ♭ ♯ „O“ ‚O‘ İ ◦ …
----◄ ▣-G-▣ ◈-P-◈ ❀ ▽ △ ∆ ▷ △ ◁ ∇ ◊ ∆
????????????????????????????????????????????????????????????????????????????????????????????????????
????????C????????????????H????????????????????N????PQR????????????????????????????Z
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º¹²³⁴⁵⁶⁷⁸⁹ ₀₁₂₃₄₅₆₇₈₉ „ · • ° º ◉ ½ ⅓ ⅔ ¼ ¾ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞ ₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉¹ ² ⁶ ⁷ ⁸ ⁹ ¹ ² ³ ¯
——— iƒpi Ø ™ ✧ ★ ♠ ♣ ♥ ♦ ♪ ♫ ✝ — |
$ € ¢ £ ¥ ₩ ₪ ฿ ₫ ₴ ₹ ♥ ♦ ♠ ♣ ← ↑ → ↓ ✓ ♀ ♂ ☺ ☆ ± × ÷ ~ ≈ ≠ ≤ ≥ ½ ¼ ² ³ Δ ™ ® ° § ∞
ⒶⒷⒸⒹⒺⒻⒼⒽⒾⒿⓀⓁⓂⓃⓄⓅⓆⓇⓈⓉⓊⓋⓌⓍⓎⓏⓐⓑⓒⓓⓔⓕⓖⓗⓘⓙⓚⓛⓜⓝⓞⓟⓠⓡⓢⓣⓤⓥⓦⓧⓨⓩ
①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬⑭⑮⑯⑰⑱⑲⑳⓪⓵⓶⓷⓸⓹⓺⓻⓼⓽⓾

WEA Manufacturing Inc. Information
Cinram, Olyphant, PA
Glass Mastered At: A mastering SID code of "ifpi L90#" WITHOUT a "wea mfg. Olyphant" logo in the mirror ring of the CD indicates the disc was glass mastered at this plant.
Pressed By: A mould SID code of IFPI 2U** indicate a CD has been pressed at this plant.

WEA Mfg. Commerce
Some CDs show the WEA Mfg. Olyphant logo in the matrix area but also have "wea mfg./CA" stamped on the hub/clamping ring. They should be credited like this:
Glass Mastered At - WEA Mfg. Olyphant
Pressed By - WEA Mfg. Commerce

Wea Mfg. Commerce pressing credits will always contain a Mould SID Code of IFPI 2V**. They may often be credited on releases with a 'wea mfg. Commerce', 'wea mfg. CA' or 'wea CA' in the CD matrix or stamped on the clear plastic hub.

(thanks to MedozK)
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