With reference to pattern 341, Robert
Copeland's book, Spode & Copeland Marks and other Relevant Intelligence, p.117, states, "Very early
series recorded in un-named book, mostly neat border patterns on-glaze. (pattern)14-710 c1794 to 1800. "
This book's information was extended and further refined by him on p. 119 "(date)1803 up to (pattern) 450".
The date of this piece by pattern, shape and material is debatable amongst the experts ranging between 1780 to 1805. However, Robert Copeland narrowed it down by pattern number to 1803.