1) hand painted, from about the 1920 until the 1985
2) hand painted under glaze from the 1934 to the 1942
3) both signature and mark are printed under glaze, from about the 1950 to about the 1985
4) sometimes there was only the mark or only the signature, but sometimes both, printed under glaze, from about the 1950 to about the 1985
5) printed signature with cobalt oxid under glaze on porcelain, from the 1971 to the 1985
6) vertical signature, this typeis rare.