I have a pair of these pieces. They're very typical for the American Studio era that is by far my favorite paperweights, the studio Art Nouveau w8s of the 70's.
There are several features that make this one quite different however.
1) The base is quite distinct for an American piece of that time, (I'm showing one, but both are the same) Every other piece I've had from that time (Orient & Flume, Lundberg, Abelman, Correia, Vandermark, Phoenix, Zephyr, Union Jack, Crider,etc) has a totally flat base, generally the matte white of the inner weight. While this one is distinctively recessed, with a rolled edge, and what I would almost call a "stretched" iridescence.
2) Again, every other piece I'm familiar with (I won't repeat the litany) features a smooth finished background, (most matte, some glossy, and some translucent) but all smooth, and uniform. These feature a very "organic" feeling, smooth to the touch, but very earthy natural feeling.
My eyes keep picking up scratch signatures around the base ridge, but it's just looking too hard, i keep picking up the coarse edges, as a scratch siggy.
The iridescence is what I would call a "soft gloss", not shiny sharp gloss, but not satin (like the classic O&F), but somewhere in between.
Any thoughts?