Lilac Parian Stoneware Jug with Grapevines

A wonderful antique English jug or pitcher from the mid 1800s.

with a stippled lilac background, a wide spout, reeded handle, and grapes with vines and bows in relief on the surround.

My best guess is Samuel Alcock of Cobridge, Staffordshire, whose pottery produced beautiful molded jugs.