Good point, Ivo. I had not considered that angle. I still think my point about capitalisation is worthwhile.
You will be amused to know that four of the last five pieces of Walsh art glass I have acquired have been labelled either Whitefriars or Powell, and one of those had a clear Walsh mark on the base. The fifth was labelled Stephens & Williams (sic.), not a glassworks I have yet come across.
Have you noticed how almost all single colour uncased bubbly glass is now labelled Walsh Pompeian, with a variety of innovative spellings?