Gang, I have discovered what I believe to be a really neat one of a kind insulator that most resembles a CD 247. The truly amazing thing about this insulator is that it has ribs under the glass like a similar Locke product (not like what APPEARS to be listed for the 247 in the new book unless I am missing something) and measures differently than the CD 247 in that it is exactly 5 and 1/8th inches tall vs. the 5.25" listed in the book. I have attached some pictures for any experts out there to view. I would be most welcome to opinions, insights, etc. I this a 247.1 or did I miss something? Thanks, Steve