I have a mustard pot made in Sheffield. The date letter appears to be 1839- a "t". The maker appears to be Walker and Hall.
The problem is that if it is 1839 then there is no duty mark which surely should be there. It could be 1911 however the "t" from there appears to be more fancy.
Can anyone provide insight?
http://a.imagehost.org/0168/maker.jpg
http://a.imagehost.org/view/0301/city
http://a.imagehost.org/view/0085/date
http://h.imagehost.org/download/0258/muspot