Porcelain Dinnerware

I have 8 porcelein dinnerware settings.  I am not sure where they came from only that my mother obtained them somewhere.  On the back of the plates and saucers there is a shape of a U with a pointed bottom of the U.  Inside the U it reads "Warranted, 22 Carat Gold, Amhurst.

On the front of the plates and on the cups there is a circular design of what looks to be cone shaped palm trees with a circle under it which, in the center of the circle, appears to have a ships wheel design in each.  The outer and inner of the plates is outlined in gold.  There is some chipping of he gold on the outter outline gold trim.

I have a set of 8 in fair condition, but two of the coffee cups have broken.  The set is large plates, small plates,  saucers, and the coffee cups.  

I am wondering if you knew where this may have come from/been made and what the value might be?  Again, the  items are in fair to good condition but with two of the coffee cups broken/chipped.  

Thank you,

Chris Butcher