General;
-Images; I don't vote without a complete set of images. ".....-Good images are good, bad images are better than no images and most importantly, no images are always better than incorrect ones......"
-Matrix variants; I dont vote on variants.
Link;
There are lists of plating plants, material supply plants, label makers, printers and lithographers, album jacket makers etc., from back in the day.
http://www.americanradiohistory.com/Archive-Cash-Box/60s/1960/CB-1960-07-30-18th-Anniversary.pdf

Label search;
http://www.cvinyl.com/labelguides/
Just search for your label and it has (for most labels) a guide for each label with a timeline of when labels changed design etc.

My interests are understanding the process of getting music from the recording studio to the consumer. I'm using discogs trove of "IP" (intellectual property) from key long time contributors and the discogs database to attempt to understand and put in perspective this information.

I've completed cataloging my collection and am continuing to refine (and correct) my previous submissions. and getting better understanding of the discog rules. At present, my main activity is profile review & research, following selected forums, assisting those who ask for help and attempting to understand more about the black art of identifying specifics on labels, deadwax and packaging.

"[paraphrase] One of my main guidelines is that if I am not "certain" (i.e. label printing, deadwax, pressings, etc.), as to any of those characteristics, I leave them blank when entering new submissions or adding to existing ones." W.B. http://www.discogs.com/forum/thread/386878?page=25#3839014

Specific Interests:
http://www.discogs.com/help/database/submission-guidelines-release
1. Plating and Pressing Plants (Lacquers, metal works and associated facilities)

There are lists of plating plants, material supply plants, label makers, printers and lithographers, album jacket makers etc from back in the day.
http://www.americanradiohistory.com/Archive-Cash-Box/60s/1960/CB-1960-07-30-18th-Anniversary.pdf

2. PR Etches W.B.
Prior to around 1977-78, PRC pressings had 'PR' written in the deadwax simultaneous to Presswell pressings, thus inviting confusion amongst record collectors. Partly due to this and partly due to PRC opening a second plant in Compton, CA, was when the PRC plant began writing 'PRC' in the deadwax - followed by 'PRC-R' for Richmond pressings or 'PRC-C' or 'PRC-W' for the Compton pressings. Both plants by this time had a "pudding bowl" pressing ring of approx. 2.75" and a smaller ring of about 1.25" or 1.375" - similar to how the label area of Presswell LP's was shaped for years." ᴚԀ

- W.B. The "Go To Guy". So willing to share. He's the man!!
Type Setting/Mastering characteristics and a wealth of vinyl historical knowledge.

- marcelrecords Identify and dating A&M label's Complements "I have the label book by Joe Lindsay It states the following:
creme label with brown print logo unboxed: 1962 brown label logo boxed: 1963-1973
grey label: 1973-1985"

Pressing Plant Numbers:
6 = All Disc Records, Inc.
56 = Columbia Records Pressing Plant, Pitman
60 = Sound Makers
73 = Columbia Records Pressing Plant, Terre Haute 25 = Columbia Records Pressing Plant, Santa Maria
70 = RCA Records Pressing Plant, Indianapolis
72 = PRC Recording Company, Richmond, IN
26 = PRC Recording Company, Compton, CA
16 = Sonic Recording Products, Inc. / Goldisc Recording Products, Inc.
18 = Presswell
19 = Bestway Products Inc.
22 = Allied Record Company
24 = Monarch Record Mfg. Co.
30 = Plastic Products
49 = Specialty Records Corporation
53 = Keel Mfg. Corp. (prior to '79); Hauppauge Record Manufacturing Ltd. ('79 and later)
54 = Shelley Products
76 = Hub-Servall Record Mfg. Corp.
74 = Electrosound Group Midwest, Inc.
28 = Rainbo Records

LABELS

Record company codes (the letters after "ST")

A = Atlantic Records
C = Atco
CAP = Capricorn
CTN = Cotillion Records LPs
CO = Cotillion Records 45s
FC = Famous Charisma
SS = Swan Song
AS = Asylum
MC = Manticore
RS = Rolling Stones Records
HT = Hilltak Records
IL = Island Records

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

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

Unknown: TvC https://www.discogs.com/forum/thread/386878?page=59#7204931

London Records label matrix suffix:
AL - Allentown Record Co.
P - Columbia, Pitman, NJ
TH - Columbia, Terre Haute, IN
SM - Columbia, Santa Maria, CA
SH - Shelley Products, Ltd., Huntington Station, NY
BW - Bestway Products, Inc., Mountainside, NJ
GL - Decca/MCA, Gloversville, NY
K - Decca/MCA, Pinckneyville, IL
PH - PRC (formerly Philips) Recording Corp., Richmond, IN
W - H.V. Waddell, Burbank, CA

Columbia "360 Sound" Label Progression
1962 - 1963 Black "360 SOUND STEREO 360 SOUND" (no arrows)
1963 - 1965 Arrows were added on either side of "360 SOUND"
1965 - 1970 White "360 SOUND STEREO 360 SOUND"

Warner Bros. Label Progression
Mono:
1958-62 - Grey label, black WB Shield, WB in gold print
1962-66 - Same, but in white print
1966-67 - Gold Label

Stereo:
1958-67 - Gold label
1968-70 - Green Label, Warner Bros. - Seven Arts Records. W7 logo under that.
1970-73 - Green Label, Warner Bros. Records. w/ WB Shield
1973-78 - "Burbank" Label
1978-83? - White or beige label w/ Narrow horizontal lines
1983?+ - White or tan label, no lines, large WB shield

● Capitol Records label progression ●

OTHER SCRIBINGS IN THE DEADWAX:

22, 33, 44, 66 etched = pressed by All Disc Records, Inc.
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 Manufacturing Co., Inc.
⍺ʙ = Al Brown (5)
BDI or B.D.I. = Brian Ingoldsby
EDP [in oval] = Europadisk Pressing & Mastering
Ⓕ = Fidelatone Mfg.
PR or PRC or (PR) = Philips Recording Company, Inc. (prior '73) PRC Recording Company, Richmond, IN (10/72)
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-#####)
MG = MGM Records Division in Bloomfield, NJ (Pressing)
AMP = ABC-Paramount
𝒜ℛP = American Record Pressing Co.
M = Mercury
MR = Mercury Record Manufacturing Company
RCA = RCA Victor
◈-P-◈ = MCA Pressing Plant, Pinckneyville
回-G-回 = MCA Pressing Plant, Gloversville ⧈-̶G̶-̶⧈
◎—∈—◎ = MCA Records (Canada)
G or G1= Columbia Records Pressing Plant, Carrollton, GA
✲ or ☆ (prior to '64) = Capitol Records Pressing Plant, Los Angeles
Lathe similar to ☖ (prior to '64), IAM in triangle = Capitol Records Pressing Plant, Scranton
—◁ = Capitol Records Pressing Plant, Winchester
RG = Rob Grenell, mastering engineer for Atlantic in the late 60's
GK = Gilbert Kong
"cg" + "☮" = Chris Gehringer
GF = Greg Fulginiti, of Artisan Sound Recorders
◵ graphic of a disc and radius gauge for the A in Artisan Sound Recorders
R3 or R4 = Mastered at Rainbo Records (on Capitol Pressing)
︵︵〰༼ -(birds) or メ or ❀、= Brian Gardner
DT = Dave Travis
DC, whereas D is incorporated into the top of the C (usually associated with Masterdisk) = Dave Crawford (2)
RJ = Ray Janos
AZ CB = Chris Bellman at Allen Zentz Mastering
JG = John 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
JG♡ = Joe Gastwirt
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)
PP = Plastic Products
TD = Terry Dunavan
ESR = Elektra Sound Recorders
GC, ℊc, ☆ or ⚾ (Baseball looking symbol) next to Sterling = Greg Calbi
Ƨ = Columbia Records Pressing Plant, Santa Maria
ELA (followed by delta#) = Electrosound Los Angeles
ℰMW = Electrosound Group Midwest, Inc.
WM (W integrated atop M stamp) or (ᵛᵛ) = Wakefield Manufacturing
⋐riteriɑ = Criteria Recording 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)
WMℰ = Mack Evans
ℐ⍺ = Jack Adelman
DWJ = Darrell Johnson
ACR = RCA Records Pressing Plant, Smiths Falls, Ontario
ℰcK = Ralph Eck
¢ = Tom Coyne
SMK (etched) = Sound Makers
THE WASP = Martin Birch
TS = Tommy Simmes
WSS = Woodland Studios
SJR = Stuart J. Romaine
US⦾ = United Sound (3)
m w/ T rising from atop, similar to ⭄ = Mastertone Studio

Note of interest: I have previously advised users "SXT" scribed in runouts denotes metal process at Santa Maria and Terre Haute press. Unfortunately, they have taken the advise of another user whom claims by "Fonts" in the label print indicate the opposite...CSM press from CTH process. See this label with "y" indicating CTH press and SXT in runouts, and also this release the same. Where labels were printed cannot possibly determine definitively where a disc was pressed. It only determines where the labels were printed.

◅ [Elongated] Keel/Hauguage
℗ © ™ ℠ ® 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 sᴛᴇʀʟɪɴɢ

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