Mine do not glow at all well. No luminosity just a dull green. They really are completely different to other uranium glass bits I have, which do have a yellow tint to the glow.
I was really wondering if it is known if this ever was made in non-U green glass.
Not a general; "I assume it was very likely.", but the short period you describe does rather help to support that position Nev. Thanks.
Mine were not a charity shop find, but a gift from an elderly friend whose parents had lived in the states for a few years, had bought it new there and then and brought it back with them.