This huge pot would have been used for either a restaurant or a large country house. I believe it is the 5kg size, which is about 11lbs.
 
In  a mellow neutral  stoneware with has two sturdy hand crafted handles. This is a beautiful decorative piece as well as a joy for a collector of mustard pots.  It is clearly stamped Paul Tremblot.
 
It is in good vintage condition, with some signs of its age, including some rust around the lip, this could probably be removed if required without damaging the pot. 
 
It is 8.5" or 21cm tall and 9" or 23cm across the widest point. The smaller Yvetot pot is available separately.