Anne, thanks for your understanding words - I appreciate them.
Now I'll try and answer your question
Anne, your bowl is Curved Star (exterior) with Headdress (interior). It was made by Brockwitz, the German glass manufacturer, circa the late 1920s - 1930s. It is possibly one of the more easily found items of Brockwitz glass in the UK (don't misunderstand me....it's not "common"...it is just one of the most popular Brockwitz items that can be found).
You have several questions incorporated within your main query. May I deal first with the Curved Star pattern, and which maker(s) made it? The great majority of Curved Star items were made by Brockwitz. In fact almost all of them. They made a huge range of shapes in the pattern - from massive epergnes and vases, to tiny little dishes. Two Carnival colors were made - blue and marigold - as well as clear glass, and red and blue uniridised. Brockwitz called the pattern "Zurich".
Curved Star was also made in just a VERY few shapes by Eda Glasbruks (Sweden), and also by Karhula (Finland). Such items are very scarce indeed - and are almost never found outside their country of origin. On the other hand, the Brockwitz Curved Star pieces can be found all over the globe (with a great amount in the UK).
Now let's tackle the Headdress issue. This pattern was probably made first by the United States Glass combine (U S Glass). It was used on their Cosmos and Cane items as an interior pattern. It was probably copied by Brockwitz. Plagiarism was rife at that time. Lots of companies copied designs. I could write (and have done) reams and reams on this issue alone.
There is no documentary evidence in the form of catalogue proof, to show that Brockwitz made the Headdress pattern. The evidence is circumstantial - it appears as an interior design on items with the Curved Star pattern that are shown in Brockwitz catalogues. It also appears coupled with two further patterns, one of which is a (known) Brockwitz pattern.
So, the evidence shows that Headdress when used with Curved Star was made by Brockwitz. But Anne has another problem - she says that the pattern on her bowl looks like the one that Dave Doty shows as being the U S Glass example.
I think the reason for this, Anne, is simply that Daveâ€™s photo of the one on the right of his pic (ie the one with the Curved Star exterior) simply doesnâ€™t show the pattern very well, as the highly reflective nature of the iridescence is distorting the details. I have studied many examples of Headdress (and many examples of Curved Star) - some years ago I made a series of drawings showing the very small differences between the variants of the design. I feel it is actually rather difficult, on a cursory glance, to tell the difference between the US Glass and the Brockwitz versions.
On all versions of Headdress, there is a repeated pattern of four plumes, around a central motif. The differences can be found if you study the patterns in detail (eg. the position of the curling tendrils, and the stamens on the central petals).
Do please ask Dave Doty for more information on this detailed observation if you find my explanation to be lacking.
Finally, Kev asks how many other carnival patterns are known in clear glass. Well, quite a few European ones were. Most Brockwitz patterns were quite possibly also made in clear glass. I certainly have seen a number of them - ditto for Riihimaki, Eda and Sowerby (eg #2266). I have not made a study of it, however, only observed in passing.
Hope this helps a little.
Note: Information above is my IP (copyright. G. Thistlewood. 2005)