Dating old columbia records
The RCA year codes are thus - One can then pin-point the disc further, as if the account number, in this case "4", falls BEFORE the "K", then the disc was mastered between January and June of 1966.If the number is after the "K", as in our example TK4M, then it was mastered between July and December, 1966. Monarch was one of the major manufacturing / mastering plants based in Los Angeles on the West Coast of the US.The second number '0987' is simply the master number referencing the tape used to make the master.
Their codes can be broken down thus: As an example I'll use the code "634P-0987".
The example pictured From 1971 to near the end of that decade, Columbia also owned and operated a studio in San Francisco, however, no custom codes were used there.
Chicago, Nashville, New York and Hollywood were only venues of recording studios operated at one time or another by Columbia - in terms of their pressing, besides Pitman (opened 1960, ceased pressing vinyl records in 1986) and Terre Haute (opened 1953, closed 1982 then converted to CD manufacture) they had another plant in Santa Maria, California (opened 1963-64, closed 1981).
It appears on both sides of a disc with an "X" added for the
Note that the Delta/triangle system was not exclusive to Monarch, and other companies such as ALCO ( see below) also utilised it indicating that they produced the metal masters for pressing from.