Nearly every glassworks in the seventies made a similar set, and all had similar colours in the program. Smoke was an unavoidable fashion colour. It is therefore almost impossible to pinpoint the set to a manufacturer - unless you happen to have a label, a box or a catalogue in which it is depicted. I'd say Germany is the most likely country of manufacture (Joska, Zwiesel, WMF, Gralglashütte) followed by France (Portieux) and Belgium (Boussu, Doyen, Rupel) and Italy (various Empoli works). And then, of course, there are a number of Swedish glass houses which could be mentioned....