Does anyone recognise this 'chop' stamp ?  I have a number of old bonsai pots with this mark.  After going over hundredsof known stamps I am at a loss as to the identity of these pots.

Many thanks to Konatsu Honda who so kindly offered this translation "I see 常滑焼(Tokoname-yaki) is the maker and 山晃釜(Yamakou-gama)is the kiln."