... lovely to see you over here too!
Aw, thank you!
I took another look at some of my Polish china, and none of the pieces are pure white. They go from an almost-white, like the Wałbrzych sugar, and the handpainted Karolina cup and saucer (first and second picture), to very grey, like the Tułowice teapot set.
I don't know what accounts for the colour... since both your piece and mine come from the domestic market, it would be good to see what Polish china bought outside of Poland looks like.