Rose, thank you, that's sweet of you to search. :kissy: It's so hard to explain what this is like... the ones you found aren't the same sort of thing, as they have a complete surface - told you this was hard! Mine is as if the yellow iridescent finish has sissed off the surface to make the clear popped bubble areas.
I'm not sure if the word sissed is a help or not, but it describes what it looks like - when I'm painting with my enamel paints sometimes one colour reacts with the underlying colour and creates blobs where the top layer of paint won't cover the base, so the base layer shows through. It's a chemical mis-match / reaction between the two paint colours we call sissing. The bubbles on the bowl remind me of this strongly.
It's as if, when the bowl was being made in clear glass, it was sprayed with the metallic salts which caused the iridising but something else was either sprayed or splashed onto the surface as well and where that hit the iridising didn't take, so it acts like a resist causing these clear popped bubble like areas.
Does that make any sense at all, or am I just rambling nonsense?