Failte is both Scottish and Irish Gaelic.
We even have it on our road signs.
https://en.wikipedia.org/wiki/F%C3%A1ilte#/media/File:Failte_Scottish.jpgI am a bit bothered by this.
The dimensions are not dissimilar to some engraved bits of Caithness, but the engraving looks all wrong for them, and the remains of the label kind of dismiss that idea too.
I'm stumped.
I don't know of much glass in Ireland. There was Kerry, there's what's left of Waterford and there's Jerpoint.
I've found too, The Irish Handmade Glass Company, J. Hill standard, Dingle Crystal, and Criostal na Rinne.