David Walker - early South Heighton pottery - Ursula Mommens or Chris Lewis
Rob - Thanks David, but sadly not South Heighton. I was lucky enough to show a piece with this mark to Chris who stated it definitely wasn't a SH piece. The mark is very similar, but the 's' shape is cut off at the bottom deliberately.
Mary - I own a pottery moon flask with a similar mark stamped on the bottom so would like to know if Rob has found out more.