Hello Barbara, I'm not that familiar with this sort of thing, but I did not think that Walsh Pompeian was irridised, also any bit I've ever seen was not quite as bubbly as this, which looks like proper pulegoso to me, as opposed to the more "Clutha" style of bubbliness of Walsh.
Caerleon is surface decorated, not bubbly, according to the picture in Lesley Jackson.
It is a good piece, whatever it is. I think I might want to start looking in an eastern european direction.
The blue piece says "Norway" to me. I don't know what the label says, or if it is Norwegian written on it.