File:Heisey Uranium Milk Glass Souvenir Cup from Hansboro, North Dakota.jpg
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English: Souvenir cup from Hansboro, N.D. (USA), manufactured by Heisey
Update: as per  this seems to more likely be "Ivorina Verde" (vs Opal) and Hansboro wasn't founded until 1905 so that's probably the earliest it could be from; still likely pre-WWI though. Confirmed uranium content by (1) characteristic green UV fluorescence typically seen in uranium glass and (2) radioactivity significantly above background (~500 vs <30 CPM) as measured with a Geiger counter.
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