Loetz (or Czech) - Schnapps cups

These are great little Schnapps cups that measure just over 1 1/2". They come with the identical mint green bases with different colors. I am imagining they came as a set of six or eight - with a few colors missing. Loetz produced Tango in these colors, they would include tea, liquor and perfume sets (with signatures) but these could belong to other companies as well...