Unmarked chawan

Large chawan or footed bowl. Unmarked. Sgraffito decoration round the sides

It looks like wax resist decoration that hasn't worked too well but I understand it isn't easy. The foot also suggests to me that it's someone learning to pot and they may well have mastered it later.

wax resist isn't that difficult

The lines are a bit too narrow for wax resist, although they may have been made with a wax pencil. There are a few potters who do similar sgraffito decoration around their yunomis based on Japanese decoration.

sgraffito is scratched decoration whereas this looks like the glaze has been prevented from getting a fix