Vintage shot glass small with plum image, Czech republic, set of four glasses

Funny shot glasses that we have never seen before. We bought them in a Czech kind of thrift shop. According to the owner, this also comes from the Czech Republic. The glasses have a print of three blue plums hanging on a branch. Set of four glasses.

Dimensions: 4 cm diameter top x 5 cm height.
Weight: 46 grams per glass.