This is a set of two Bizen-yaki tea bowls. They have a maker's mark that appears to be "Mu." I am not a specialist or appraiser, so I cannot say for certain, but I believe the "Mu" signature may be that of Heizan Okamoto. However, this is not a definitive identification. Please examine the photos provided and make your own assessment. * (Heizan Okamoto) Born in 1929, he studied under the second generation of Rakuzan Fujiwara, an Intangible Cultural Property of Okayama Prefecture. (Size) * Large tea bowl: * Height: Approximately 8.7 cm * Diameter: Approximately 11.5 cm * Small tea bowl: * Height: Approximately 6.5 cm * Diameter: Approximately 11.5 cm