Recently we purchased this item at a very high end estate sell. Most of the auction was for Chinese items, all went for very high values. This was grouped with some beer steins and she did pay a bit. Mold letters are I.E which would indicate 15th-16th century mold. Please send us an market appraisal.
Only know it was a wealthy collector, doctor whom spent time in China and Europe
Thank you for all the additional photos and information. Your jug is made out of stoneware with molded designs and has been glazed with cobalt blue salt glaze and is known as Westerwald stoneware. Westerwald is a region in Germany along the Rhine that was known for its high-quality stoneware production. While the piece is missing its metal lid, it is still in good condition with no visible signs of damage to the body. The cover presently accompanying the jug is a late 19th-century addition. The pitcher comes from the workshop of Ian/Jan Emenes Mennicken. The center of the vessel features the decorative Coat of Arms of the van Bassen family along with Mennickens initials, which he commonly used to mark his pieces. Jan Emenes Mennicken is credited for mastering the cobalt salt glaze process, which is the trademark for all Westerwald pieces. Based on recent price realizations for pieces similar to yours, a fair market value estimate would be between 500 and 2500 US dollars. Please let me know if you have any further questions.