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Guidelines

Formatting Options

Pressing Plant Codes for LPs:




PR = Records Mfg. Co., Ancora, NJ (they handled most of Atlantic's LP's during much of this period)
LY =
SP =
MO =
PL =
RI =
AR =
CT or CTH =
CP =
CS or CSM = ; very infrequently)
BW =
SO = Holbrook, NY
MG or MGS = MGM Record Mfg. Division, Bloomfield, NJ

LP label 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

A&M
B =
C = (through 1984) or (1985–1986)
R =
W =
X =
Y =
Z =

Pressing Plant Numbers:
56 =
73 =
25 =
70 = RCA, Indianapolis, IN
72 =
26 =
16 = Sonic Recording Products/Goldisc
18 = Presswell
19 =
22 = Allied
24 =
30 = Plastic Products
49 = Specialty Records Corporation
53 = . (prior to '79); ('79 and later)
54 = Shelley Products
76 = Hub-Servall Record Mfg. Corp.
74 = Electrosound Group Midwest, Inc.

Ⓒ Ⓟ ™ ℠ ® ▷ △ ◁ ∇ Δ ◊ ∆ £ ↔ ℒ • · ˙ Ψ º ժ Σ ● ႴⓌ

London Records label matrix suffix:
AL - Allentown Record Co.
P -
TH -
SM -
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 -

F/W Ѽ - Frankford/Wayne Mastering Labs
◈-P-◈ =
回-G-回 =
-------◁
✲

RCA Victor 20-2378

GC, ℊc, ☆ or ⊗ (Baseball looking symbol) next to Sterling = Greg Calbi

SRC CD generations

RCA Victor Master Serial Number Codes - 1942-1980's

Jacksonville pressings, between c.1968 and 1969-70, a large "O" was hand-etched in the deadwax, rather than a machine-stamped "0". The main key is that on LP's, the pressing ring diameter was 1.5", while on 45's there were the 360 interlocking serrations and small 3.3125" diameter center labels.
http://www.discogs.com/forum/thread/386878?page=24#3836309

Winchester (-WW#) had 1.390625" diameter, in the way it was shaped it was borderline deep groove.
- Jacksonville (-JW#) had 1.5" diameter.
- Los Angeles (-LW#) had 1.5625" diameter.