Salviati Murano Uranium Glass Hand Blown Plates.

I think these are more interesting than they first appear. They are quite thinly hand blown uranium glass and they have been left with rough pontils but have concave bottoms to avoid damage to furniture. They vary in size from 6 1/4 to 6 1/2" and are decorated on the back with spiral iridescent gold swirls. I have now found a couple of pieces online with the same decoration attributed to Salviati, Murano so I'm identifying them as by that factory (or possibly Barovier Toso). They cost £3 from a charity shop.