Spring Records

Spring Records was formed in 1967 by Julie Rifkind.
** For (unofficial) releases, see label: Spring Records (7).
The label was owned by Polydor (which would later acquire MGM).

Starting in the mid-1970s and continuing into the late 1980's, the center labels of US PolyGram sublabels began showing two-digit number ID codes signifying from which pressing plant the record originated. A partial list of confirmed plants and their corresponding numbers are as follows:
6 = All Disc Records, Inc.
16 = Sonic Recording Products, Inc. (pre-ca. 1975), Goldisc Recording Products, Inc. (1975 to ca. 1983), Electrosound Group Midwest, Inc. (post-ca. 1983)
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
49 = Specialty Records Corporation
53 = Keel Mfg. Corp. (pre-1981), Hauppauge Record Manufacturing Ltd. (post-1981)
54 = Shelley Products
56 = Columbia Records Pressing Plant, Pitman
57 = Columbia Records Pressing Plant, Carrollton, GA (post-1981)
60 = Sound Makers
70 = RCA Records Pressing Plant, Indianapolis
72 = PRC Recording Company, Richmond, IN (post-Dec. 1972)
73 = Columbia Records Pressing Plant, Terre Haute
76 = Hub-Servall Record Mfg. Corp. (post-1970)
There are some numeral codes which have so far been unconfirmed as to their corresponding pressing plants, including 30 (either Plastic Products or Peter Pan Industries) and 75 (presumably MCA Pressing Plant, Pinckneyville); plus other manufacturing codes (i.e. for cassettes) including 12 and 35.