Jeannine,

      Have you looked at Trish Samford's article "Response to a Market:
Dating English Transfer-Printed Wares."  It has been reprinted in the
second edition of the SHA reader complied by David Brauner which is titled:
Approaches to Material Culture Research for Archaeologists. It is available
from the SHA for $25.00.  Page 77 in the reader has some information on
printed and painted wares.  These begin to show up in the 1840s and became
more common after ca 1870.

      Your question on Jackfield is difficult to answer because these wares
evolved into refined black glazed redware teapots that continued to me made
through the 19th and into the 20th centuries.  The "silvered" refined
redware you describe sounds like luster ware and you should be able to find
some dating information on it in some of the compendiums on English
earthenware.

George L. Miller
URS Corporation
Florence, New Jersey