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Hi hourglass
I can quite understand why you think it might be Victorian, but it was made in the 1960s at Pilkingtons, St Helens, by Czech glass workers. You see quite a few about (including a couple I put into Gorringes auction recently...). They occur with smaller flowers too, and occasionally names in yellow or orange rod, and I have seen simple outline butterflies - but they always seem to have this rather blue-green glass, and the very characteristic yellow flowers. The style is old, but the weights are not!
Alan