The CD 743.1, 743.2 and 743.3 have been located in Canada, primarily along railroad right-of ways. Judging from the dates that most of these railroads were constructed, the production of these items took place primarily in the early 1870's. This general style was also made with threads, some in the same molds as the threadless units. Years later, the beehive shape with threads became the standard on Canadian railway lines. The CD 743.2 and 743.3 have been located in various aqua tints. The CD 743.1 has been found in aqua, green, and vivid blue.
The CD 788 is a very unusually-shaped insulator and remains quite rare at this writing. While it is likely they were used elsewhere and possibly others have been found, the only confirmed location of their use has been in one area of Alabama near where activity of the Confederate Army took place during the Civil War. It has been speculated that the grooved top on them was designed to help in the rapid construction of military lines when the lack of time prevented using a tie wire on every insulator. This theory seems to have some validity, although a similar item was patented in 1874, long after any need for rapid construction was necessary. Most of the CD 788 units found are deep in color, usually a dense amber. A few, however, have been located in lighter shades of green.
Another of the interesting designs found in the same area as the CD 788 is the CD 790. These were located with the CD 788 in Alabama, and like the CD 788, are of a design which could have been used without a tie wire. Aside from that particular location, they have also been found elsewhere in Alabama, Georgia and in Florida. A CD 791 was purchased by a collector in Pennsylvania, although no documentation of its use there exists. At least two broken examples have been found in the South.