Small hand painted dish, various marks, Polish?

I may well be barking right up the wrong tree with Polish, I have had this little dish for a couple of years now and I am no wiser about it now than when I first picked it up. It is fairly small at 12 cm in diameter, light in weight and has embossed, printed and hand written marks on the base (including M. Gralewska).









Any help would be very welcome!

John