Regarding the manufacture of majolica porcelains, I have been wondering what the historical connection is between Sarreguemines, Portieux and Vallerysthal? Could anyone please provide some information or point me toward links this? Were these towns in France where the the company established factories? I see a lot of Sarreguemines majolica marked PV… and therefore wish to know about this and history of the PV mark? Thank you.