Black Mark Production (founded 1991) is an independent record label originally based in Berlin, later on with offices in Stockholm, Toronto and New York City. Black Mark Production today is a worldwide operating business placed in Villa Hammerheart, Bruzaholm, Sweden, that specializes in extreme metal releases. It is perhaps best known for its close connection to Quorthon, leader of the defining black metal band Bathory until his death in 2004. History.
https://en.wikipedia.org/wiki/Black_Mark_Production