Just got this mug. The seller claimed it was 1793, and that the maker is James Phipps I. The date letter looks correct for 1793, but the date letter for 1813 looks similar, too, and the duty mark could allow for either.
I couldn't find a mark for Phipps in the marks on this site.
It doesn't look unlike John Bull. Thoughts or directions you might send me?
![Image](http://www.theelectrumgroup.com/phipps2.jpg)