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Thread: Old designations for standards/masters

  1. 03-07-2011, 11:09 AM #1
    mpcarrier66
    Guest

    Confused Old designations for standards/masters

    I've come across some master setting rings all marked with either of the following; AR, MR, or SR. How do these designations compare to today's Class Z, Y, or X?
    Last edited by mpcarrier66; 03-07-2011 at 12:39 PM.
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