
Last week, I bought 4 simple cups for little money. They have got a stamp on the bottom: Nippon (Japan) Tokusei (special made). The stamp should indicate that these cups were made during the Showa reign (1926-1988). I have found one source saying that this particular seal was used before WWII (because it was written right to left) and one source that says that they could also been made after WWII. Who is right about it? And how was the quality of the Japanese clay back than? I am trying to learn more about Japanese teaware.