CD 1066.5:

5 3/4" X 5" (146mm X 127mm)

 

(around top) FOLEMBRAY // No. 905-2

 

Picture courtesy Don Mecklenborg

This is a spool insulator which is unthreaded and mounts in a holder with a pin through the center.  These were typically used to dead-end a power or communication line.

CD assignmant by N.R. Woodward in 2007.

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