This large classic Fred Locke three part is marked with Locke's 7-1 marking . I also found pieces of these with marking 6-1. This insulator was the Locke #331 first catalouged in 1903 when a series of these three part mushroom shaped multiparts were introduced. There were basically three sizes of these three parts with 8" 9" and 10" tops The actual size of these is 10 1/2-7-7X10" Several versions of the 8" top multipart have been found by collectors (M-3060, M-3062)[id=194735881], The 9" top version (M-3150a) with Fred Locke markings is a one of a kind insulator from the Locke dump. I finally reconstructed one of these 10" versions which nearly completes my collection of Fred Locke cemented multiparts that were actualy used on early lines. This large size three part was never popular and saw only one installation on a single line in Utah. The base skirt of this insulator is the same one as the M-2785 and M-2842a. This insulator has been a real challenge to find and the top still needs some reconstructive work as you can see. I spent more then 12 hours at the pole sight collecting and digging up broken fragments to repair it!!

Here is a compairison photo with a locke gutter top[id=248185576]