On piece #1, CathyG posted a similar label on page 1 of this topic, but it doesnt have the "Lido" on top. DenCill also posted a similar label on page 4, and Anne E.B. posted a good description of where it came from at the bottom of that page.
I think maybe "Lido" was for a particular maker that sold for George Hardy (importers?)?
The #3 piece has a common Venetian Glass label, not a Seguso label.