Ken thanks so much for clarifying re the Phoenix decor - your description is great and I know exactly what you mean now. I know nothing about B&Sandwich but there has been some confusion on here before with a piece that turned out to be Bohemian. I guess they will have made many similar items over the years - very confusing especially if the books are scarce to come by (or expensive) and also if you are the other side of the pond

I'm always especially wary of looking at overlay glass pieces being sold in the USA because it's so incredibly difficult to tell whether it's American or Bohemian in some cases

Roy, the problem with photos is that your jug also looks, on my monitor, to have clear overshot on it. I'm struggling to see the iridescent finish although I know you've said it's there and I'm trying to view it as such. So it's possible that what one sees on a photo is not how the owner can see it in real life if you see what I mean.
If I was you I'd concentrate on trying to match it to a known Harrach or attributed Kralik shape. I think it should be possible

m