This is the first and only dead mint all original cement example of a Fred Locke multipart from the Locke 25 line that I have seen . Wile they may not command the collector value of the all glass CD 342 Fred Locke multiparts used on the same line,, the porcelain units from the famous Locke 25 line are actually much rarer then the glass ones with only about 15 mostly repaired examples known of the four different designs used there. Of these the fragile lilyshell M-3721b is one of the rarest with only about four known all of which are repaired. this specimen has a weak Fred Locke 7-1marking.. Recently this dead mint one surfaced in a western collection that was acquired by the John and Carrol McDougle the insulator quickly passed through the hands of another porcelain collector, Reed Thorne, who ended up with a beautiful M-2332 in the deal as part of the trade, that brought this piece into my hands. Incidentally the M-2332 is of special interest to Reed as the only line in the Western US that used them was in his home state of Arizona. How it survived, where or when it was found on the line is unknown . It must have been long ago picked up by a lineman when the line was still in use sometime from the 1930's or 40's as it would likely have split apart from frost and cement expansion if it had been out on the line till modern times . It could also have been saved long ago by an employee of the Skagway power plant years before the plant shut down in 1965. These insulators were all removed from service around 1915-1923. It is definitely the crown jewel of my collection of insulators related to the Locke 25 line and, frankly, If I had my choice between a mint CD 342 and this, I would take this piece !