This is Hanke stein 1769. Frank has it in TBSL, maybe he can give you a copy without his logo. He used to have a Steinzeugwerke catalog, but he got rid of it when he decided most, if not all, were Hanke steins.
Did you see the question on the Seven Electors stein on SteinTalk? I presume your article will mention the other two faces on the mountain. Frank didn’t address them in TBSL.