Here is a nice little olive blackglass no embossing threadless insulator that I picked up at a local flea market. I can't tell if it's a CD 740, which I think it is, or a CD 740.3. It measures 3 3/8" across the base, like the 740, but it's only 3 ¼" tall. And the inside of the skirt has a ridge, like the 740.3, which is shorter than the 740, but taller (and wider) than this one. This one also does not have a ridge that extends beyond the base like the 740.3. Frankly, this looks more like a hybrid of both CDs. Anyone else have one like this? Inquiries welcome.
Thanks to Mike Deloia: This is a CD 740, a US made piece. I've seen them in Green, Amber, Olive . . . the Amber ones were most likely made at Stoddard.