I can see why Val St Lambert may be an idea M. However, I myself know little of their output other than their more colourful cut vases and have the feeling that much was signed. It has taken me a while to return to this thread as I have been temporarily (happily) lost in http://www.glas-musterbuch.de
which has a vast array of catalogues, from some producers who I had little idea existed!! What a great site, largely thanks I think to GMB member Pamela and her fellow collectors. There are factories and refineries, finishing/ decorating businesses now gone, many of whom produced amazing glass. One of these may be responsible. Very similar cutting to this vase appears in one glassexport catalogue, referred to as containing the produce of glassworks from Novy Bor. http://www.glas-musterbuch.de/Glassexport-Novy-Bor-195.154.0.html
at the very bottom of the page there are some quite similar cuts, but not exactly the same. I imagine many glassworks in the region contributed whatever they could make to the catalogue.... Very interesting reading though! A labelled example may surface one day......
If I am not on GMB for a while, I may just be lost on glas-musterbuch.de looking for patterns!