CD TBD (#138):

1 3/4" - 3" X 9 1/2" (44mm - 76mm X 241mm)

1 3/4" - 3" X 9 1/2" (44mm - 76mm X 241mm)

No markings.  These unusual insulators were designed to insulate a wire as it passed through a wall mount where they would cement in the center.  Picture and information courtesy Don Mecklenborg.

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