vintage Italy crystal clear pressed glass coasters / individual ashtrays, set of 6

Set of six crystal clear pressed glass coasters, made in Italy (marked as shown in the photo).

These are 3 1/2" across the dish, inside the rim - they'd easily hold most glasses. They have a notch on the rim to double as ashtrays.

All are nice and clean in very good condition, I don't believe these were ever used at all for ashtrays or coasters!