OK, here's a lineup of No Embossing CD 145 Beehives. On the far left, we have a typical Pennycuick - bubbles, thick and heavy, crude, top of pin has a big drip, and sharp threads. Next is a typical Grand Canyon - dome gouge, squared threads, (some clears have radiused threads) and an extremely short inner skirt. Next is the Canadian - unknown some attribute to Brookfield as the inner skirt has 4 equidistant little vents. Inner skirt is tall, and has MLOD. On the far right is an unmarked American - almost no threads at the top of the pinhole, and thin ones near the bottom. Skirt is not round, but wavy as if it were pinched while hot.
Email me if you have questions.