Japanese(?)/Chinese(?) Tea Set

Hi Guys. I inherited an oriental tea set some years ago and I am now keen to find out a bit more about it if I can. It consists of i large pot a smaller jug, a two handled lidded jar and an open bowl as well as the usual cups saucers and plates. It appears to be made of a very fine porcelain (eggshell?) and appears to be hand-decorated with pictures of birds of various species. The quality of the painting is quite astonishing and the fine detail achieved is remarkable. Each piece is marked with what I believe is a factory mark and possibly an artist's mark. The attached pics show the mark and also give some idea of the quality of the decoration. Any ideas as to the origin and also whether there is someone who can interpret and decipher the mark. Many thanks.