I'm revisiting this ID request. All these insulators are round based with MLOB and all the skirts are different. I've added other pics of the insulator all the way to the left before believing it was an 005 with a slightly smaller #4 at the top when the 005 has a #8. Didn't have a 005 at the time so I was using memory the best I could to discribe. Now I can see an obvious difference. The 005 is the only round base in price guide with a number on the top of the dome. So what EIN would the insulator on the left be considered. Unlisted?? Any replies would be appreciated. If you have one like my example here, it would also be nice to know where yours came from if you have that history. So far I've found 6 or more of them in New York State.