The Fancy Fox has dated this Copeland Porcelain Armorial Plate to the Victorian era.
In an ornate scrolled, feather frame is a shield decorated to one side with a stag's head against a red ground surrounded by three crowns. The other has a white cross over a blue ground with two quadrants also with three crowns. The motto "Stand Fast" runs around the outer ring. An armoured helmet rests on top of the shield and is topped with a burning hill, or mountain, which coupled with the motto, is the crest of various families of the name Grant. Three crowns on a red ground is also the shield of a family Grant, but I haven't been able to determine the source of this variation. Copeland stamp to the reverse and pattern number D1640, c.1859-1860.

Reference: Fairbank's book of family crests of Great Britain & Ireland.
It measures 22.5cm (8 7/8") wide and 2cm (3/4") high.
In excellent condition with no damage, repair or restoration and very minor handling wear, just a couple of faint scratches to the blue ground.
The Fancy Fox has dated this Copeland Porcelain Armorial Plate to the Victorian era.
Offering fine porcelain and pottery, 18th century and later, silver, glass and other small attractive pieces
You can view the stock and full dealer information on the The Fancy Fox Profile Page