This is the same glass insulator, but now shown with a different letterhead. This letterhead is dated: May (or is it March?) 9, 1892. Note the change in the letterhead from this previous one [id=246193131] . Notice what was ordered this time: Glass insulators and wooden brackets! 175 D.G. Glass Insulators-likely Deep Groove styles. Funny, how they only needed 50 wood brackets for those 175 insulators!