M, X, OP and S Series - Schematics

The following index features the Columbia Masterworks 78rpm M, X and OP album sets indexed alphanumerically according to set numbers. The following schematic information includes set number; record sizes; quantity of each set and what record sequence formats the set was available.

For the M series, M, AM and MM refer to record sequencing information for Manual, Automatic and Drop Manual. See our prefixes page for more information regarding these formats.

For the X series, X and MX refer to record sequencing information for Manual and Automatic. See our prefixes page for more information regarding these formats.

This information may be useful to collectors when wanting to collect all available versions of a set. At a glance, a collector can source schematic information about each set.


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