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Orders taken by the office would then be sent to Columbia's Chicago studio to have the master lacquer (acetate) cut, which would then be forwarded on to the plant in Terre Haute.
The master number is 10117 whilst the label number is 6412. From January 1967 a pressing plant code was added to the master numbers: Like RCA and Capitol, Columbia's pressing plants and mastering services were used an awful lot by smaller independent local labels.
During 1969, the "X" was replaced with a backwards Dating back to 1949 and originally based at 512 Franklin Street, they relocated to #453 Chestnut Street, next door to Matrix of Nashville and changed their name to United Record Pressing Inc. Their codes began during the early 1960's and are sometimes noted on the label, but always in the dead wax, followed by a 3 or 4 digit number.
However, in some cases the "SO" code does not appear in either location, and you'll then find a number "5" and a "Nashville Matrix" script code in the dead wax.
Finally, during 1966, their Chicago studios were apparently so busy that their last set of numbers put the number (3/4/5) in the first position and the year in the second (4TKM! And as to the period up to 1962, the second position was 7, 8 or 9 (indications same as 3, 4 or 5, respectively, post-1963), 'O' was their code for "Phonograph," and 'W' denoted a 7", 45 RPM release. It's possible to date their work to the month and year of release via the "Delta number" - see the grid below.
, which consists of a scratched in triangle shape followed by a 5 digit number.