© ℗ © Ω △°·*○™ •
A&M:
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

Capitol pressing plant logos:
─◁ 'Longhorn' = Winchester, PA
★ 'Shining Star' = Los Angeles, CA
✲ or ☆ prior to '64 = Los Angeles, CA
IAM 'Triangle' = Scranton, PA
0 = Jacksonville, Ill

Decca:
(1) ✤ / ◉ = Gloversville
(2) ◆ = Pinckneyville
(3) ◈ = Richmond

MCA:
(1) ⧈-G-⧈ = Gloversville
(2) ◈-P-◈ = Pinckneyville

Atlantic:
PR = Presswell Records Mfg. Co., Ancora, NJ
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 = PRC Recording Corp., Richmond, IN
AR = Allied Record Co., Inc., Los Angeles, CA
CT or CTH = Columbia, Terra Haute, IN
CP = Columbia (Pitman, NJ)
CS or CSM = Columbia (Santa Maria, CA)
MG = MGM Record Mfg. Division in Bloomfield, NJ

Additional Pressing Plant Information:
❀ flower and bird motifs to the right of AZ = Brian Gardner.
ⓤ = Pressed by United Record Pressing
ɑ, a, Q, O Check Allied Record Company
@ (DC Interlocked) = Dave Crawford (2)
AL = Allentown Record Co. Inc.
AR or ARC= Allied Record Company
ARP = American Record Pressing Co.
BW = Bestway Products Inc.
CS or CSM = Columbia Records Pressing Plant, Santa Maria
G or G1= Columbia Records Pressing Plant, Carrollton, GA
H (RCA Releases) RCA Records Pressing Plant, Hollywood
HRM = Hauppauge Record Manufacturing Ltd.
I (RCA Releases) RCA Records Pressing Plant, Indianapolis
LY = Shelley Products
MG or MGS = MGM Record Mfg. Division, Bloomfield, NJ
MO = Monarch Record Mfg. Co.
PH = PRC Recording Company, Richmond, IN
P, PIT = Columbia Records Pressing Plant, Pitman
PL or PP= Plastic Products
PR = Presswell
PRC = PRC Recording Company, Richmond, IN
PRC-C or PRC-W = PRC Recording Company, Compton, CA
RI = Philips Recording Co., Richmond, IN
R (RCA Releases) RCA Records Pressing Plant, Rockaway
SO = Sonic Recording Products, Inc.
SP = Specialty Records Corporation
Ƨ, S, SI, S S2, = Columbia Records Pressing Plant, Santa Maria
TI, TII, TII, CT or CTH = Columbia Records Pressing Plant, Terre Haute
T, 1T, T1, 2T, T2 = Columbia Records Pressing Plant, Terre Haute
X = Embosed or S Backwards In or out of circle = Shelley Products

Others:
MR = Monarch Record Mfg. Co.
∴ or Λ = CBS Pressing Plant, Aston Clinton

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
77 = All Disc Records
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 = Sonic Recording Products, Holbrook, N
MG or MGS = MGM Record Mfg. Division, Bloomfield, NJ

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

Other scriblings:
AT = Mastered by 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 = Abbey Record Mfg. Co. (? we still don't know the exact meaning)
EDP [in oval] = Europadisk Pressing
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 Productions
Porky or Porky Prime Cut = George Peckham
Pecko Duck = George Peckham
sƒ = Sam Feldman
RL = Bob Ludwig
LH = Lee Hulko
ɑ = Allied Record Company (usually followed by B-XXXXX)
MG = MGM Record Mfg. Division in Bloomfield, NJ
AMP = ABC-Paramount
M = Mercury
RCA = RCA Victor
◈-P-◈ = MCA Pressing Plant, Pinckneyville
回-G-回 = MCA Pressing Plant, Gloversville
G or G1= Columbia Pressing Plant, Carrollton, GA
✲ = Capitol Records Pressing Plant, Los Angeles
—◁ = Capitol Records Pressing Plant, Winchester
RG = Rob Grennell
GK = Gilbert Kong (GK)
"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
AZ CB = Chris Bellman at Allen Zentz
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
TLC = The Lacquer Channel, Toronto
FW Ѽ or FWNY = Frankford/Wayne Mastering Labs
△XXXXX = Sheffield Lab Matrix
GOL = Goldisc Recording Products, Inc.
CSB ♪♪ = Carlton Batts
PP = Plastic Products
TD = Terry Dunavan
ESR = Elektra Sound Recorders
GC or Baseball looking symbol next to Sterling = Greg Calbi
Ƨ = Columbia, Santa Maria

Mastered, duplicated and quality audited exclusively with Ampex professional recorders, on Ampex tape.
This tape recording contains two automatic reversing signals, one at the end of side A program, the other at the end of side B. These program reversing signals function only with tape recorders which are equipped with Ampex-style reversing circuitry.

Mastered and quality audited by Ampex. Duplicated by Ampex in Elk Grove Village, Illinois, U.S.A. on Ampex professional recorders, using Ampex tape.
Automatic recording signals permit complete tape play from beginning to end, without reel turnover, when used on tape recorders equipped with Ampex-style reversing circuitry.

MFG./PRINTED U S A
BY GRT MUSIC TAPES
DIVISION OF GRT CORPORATION

Resources:
http://www.globaldogproductions.info/
http://45-sleeves.com/
http://www.recordcollectorsguild.org/
http://www.goldminemag.com/
http://www.bsnpubs.com/

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https://www.ascap.com/Home/ace-title-search/index.aspx

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