Boch Frères Keramis (B.F.K.)
Boulevard des Droits de l'Homme 19, La Louvière, Belgium.
Hersteller / Manufacturer
Founded in 1841, to 26th February 2009 declaration of bankruptcy in the court at Mons. Patrick De Maeyer, new CEO of the Royal Boch has restructured the company, which hopefully will continue on a different site in La Louvière.
References: Boch Frères
Ink stamp, around 1920 
This is an illustration of the applied moulded marks, shown in the right hand column, which were to mark the Médaille D'or awarded in 1847. 
Ink stamp, B.F.K. for Boch Frères Keramis on Delftware, dated not before 1870. Teniers was one of a family dynasty of Flemish painters over four generations, all called David, stretching from 1582 - 1731, originating from Antwerp in what is now Belgium. It is unknown, specifically which Teniers painted this portrait. 
Ink stamp on featured stein. 
Applied moulded mark, 1847 - 1870. Boch Frères Keramis. 
Applied moulded mark, 1847 - 1870. Boch Frères Keramis. 