Help with ID please - Yellow Pot

A friend gave me this yellow pot. It is clearly stamped with a conjoined "JN". I can find no information on the mark. Can anyone out there help? My feeling is that it is European but that is just a wild guess.

Perhaps the photo is from a deceptive angle; it is definitely not an amateur piece, and seems at least 50 years old.

Pip, Sorry to sound so defensive as to provoke you. I appreciate your taking a look and offering an opinion. My reasons for thinking it not amateur are I thought the "looseness" of treatment was intentional, and as an amateur potter myself, I have not been able to throw anything nearly that thin (it is very thin). As for the age remark, that was just something I forgot to mention in the original post and didn't know if it was pertinent or not. That said, as I further examine this pot, I notice what appears to be some very small writing along the lower edge of the foot, just below and to the left of the stamp mark (?). Any further thoughts?
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bump.

a bit of a puzzle,it has aspects that resemble French 'country pottery' but the shape and incised decoration reminds me of Belgian and German pottery....Possibly the potter was influenced by European pottery and tried a bit of everything