CD 734:

This is probably the most common of the threadless styles.  These were intended to be used for an overland telegraph line that was to go through Canada, Alaska, and across the Aleutian Islands to Russia to as an alternative to the trans-Atlantic cable.  These were dumped in a large cache in Canada with wire and other equipment when the plan went bust.  Collectors were able to retrieve hundreds of these allowing them to be within the reach of most collectors.

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