The classic Grey Poupon mustard pots, they are antique from the late 19th / early 20th century and have the manufacturer's stamp on the base. The larger is more uncommon as it is Creil et Montereau.
 
Their monochromatic lettering and images look particularly lovely grouped and sit well with other ironstone crocks. 
 
The smaller pots measure 4" and the larger 5" all pots show  signs of wear and age but the rarer larger one has an old chip on the neck and a small chip underneath.  The base is shown in picture 2 which can be enlarged.