a Western Electric 6B key question

Every WE 6B key I have ever seen has the number 4 on the knob. What does it signify? I think the 6B was part of some kind of test set or central-office panel, so it probably refers to the operating manual or instruction sheet.

If you know the answer, please tell me in the comments.

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  1. […] a post back in February I wondered about the numeral “4” on the knob of a key I had bought, and asked my […]