Thanks for letting us know, Steve. I am assuming this type was therefore mass produced (machined)? They do have the markings Italy to the base nearer the centre which is part of the glass during it's making. Any ideas as to the company that manufactured these? I would very much like to get my hands on another four, if possible. Then I would have the set! I have looked on a lot of sites and still not able to find this particular fluted drinking glass. Nason Moretti's drinking glasses tend to differ in shape but have the same colouration. Out of pure interest. Did Nason Moretti design one that had the same specification?
I think your right though, they do look machined and sprayed. I tried marking an area with a very sharp object, to not only test the quality, but also to see how thickly the glaze colouring has been applied.

I must say, the paint work is very good compared to some glass I have seen in the past.