Interesting old quirky tankard with applied enamel, French?

Hi forum, I bought this unusual old item last week because I liked it and looked interesting. it has some surface crazing and looks to be made from two different colours of clay, red (lower) and white (upper). The red clay is clearly visible to underside but looks very dirty even after trying to clean? The decoration is raised and looks like enamel. I have a feeling that this is French but not certain, maybe Longwy? but no signatures or stamps to underside. Any assistance in identifying would be brilliant. Regards Alex