The term "faux cameo" is one that I have not seen defined in any of my books. But it certainly is used a lot and there are plenty of google references in connection with both glass and general jewelry.
The use of the term seems to be for any item that looks like cameo work but was not actually, and wholly, hand-carved. This surely implies that any glass item that has been acid treated, even if finished with hand carving, is "faux cameo".
And yes, some people use the term for certain Webb vases from the 1930s. Here's a typical example I happen to have:
Whole thing ... http://i2.tinypic.com/qytngx.jpg
Signature part ... http://i2.tinypic.com/qytnki.jpg
But Manley spoke of "psuedo-cameo" and, taking references from the British Glass Between The Wars
catalogue, the advertising literature of the time called the Webb pieces "Cameo Fleur".
The Great Glass site gives a reference (but not a definition) within the glassmakers section:
Bordeaux, France (1910 - 1945)
Glass refinery, "faux-cameo" enamelling, often in the Nancy style
Whether Ivo's vase is Peynaud, I would not like to say. It does not seem to fit the "enamelled" comment that Great Glass make. But it does look French(ish) to me. I don't think it's English. And note the difference in background finish between Ivo's and the Webb vase. The Webb ones are all (?) finished with the typical stippling to the clear parts.
One other point of interest is from Manley. He said, c1980, page 22 of Decorative Vistorian Glass
To my knowledge, a type of pseudo-cameo vase has been around Britian for at 50 years. ... shaped like an Indian club ... very heavy ... a decoration of raised leaves and flowers beautifully enamelled ... seen scores of these vases sold as French and I have little doubt they are French, yet when Richardson's sold out in the 1930s, a number of these vases in various hspaes and sizes, were found in the glasshouse.
Anyone know when the term "faux cameo" came into general use for glass items? And who first used it?