Japanese Egg Shell Tea Set

I have just got this tea set down from the loft. It was my Grandmothers, and it was handed down to me. It is made of egg shell porcelain, not of the best quality, and I think the Japanese must have exported tons of these tea sets, and sadly now, they don't seem to be very appreciated. I was hoping that someone here could read the hand written mark on the base. All the pieces had this mark on it, and I assume it says made in Japan, but it would be nice to know!