Porcelain weights made in Poland.
20 dag down to 1 dag. 1952.

This sets exist with 5 and 6 weights.
Not very rare.

The Porcelain is filled with lead to calibrate the weights.

dag means Deka Gram ( x 10 )
dkg means Deci Kilogram ( 1/10 of a KG )

So 20 dag / dkg are 200 gram