Not easy to find and I have always liked this shape. For Brookfield enthusiasts, I was surprised to find this is what, from my research, I call either "Kaolin Glass" or "End Game" glass (in Brentspeak).

SO????

Well...I believe this piece can be dated!

H. Morgan Brookfield did something in 1912 (and then again in 1915) that was thought to be be impossible. He found a way to make glass tougher by upping the normal kaolin content - making a much harder glass.

This is made from the 1912 patent which made a blue-ish kaolin glass (often with white chunks - the patent says it's not furnace brick but kaolin). The 1915 patent made dark colors (think tiger striped 145s [No. 44 style], dark olive amber 101s, dark green No. 36 signals, dark 152s, etc.).

So it may be the Brookfield Teepee was produced in 1912 at the earliest, and maybe (?) stopped when/before they started to output the 1915 formula. These are not easy to find, so it makes sense the run was limited. The number of these NOT out there could easily have been produced in a couple of weeks or less with the numbers of insulators being pumped by Brookfield at this time.