A pennycuick style 149 no name "Burbrook" insulator. Note the unusually wide 4 mm overpour flange at the base mold line (all too easily chipped off - this one is missing almost half of the overpour). I've seen these 149s in a variety of sizes. The Brookfield ones are considerably scarcer. One guess I have is that the Brookfield 149 was an unsuccessful attempt to make a wide groove 145 beehive which was eclipsed by the more sturdy 164 (yes, that's a deep olive Brookfield 164 on the left in the picture). (also, on the right is a 135 BE Chicago)