Ok, after muchos Googling, this is the best I can find in the way of proof:
[
Link 1] - A pair of white goblets like yours, which apparently used to have the Casa Pupo labels.
[
Link 2] - Same design, different colours, apparently have the label, but no pic shown. The red one reminds me of your items Keith!
[
Link 3] - Some info about Casa Pupo.