Large C.19th Porcelain Cup & Saucer : Amherst Japan Pattern

This is a beautiful antique English porcelain tea cup and saucer in the Amherst Japan Pattern. Larger than usual. I'd date it to between about 1830 and 1860.
Condition: looks good, displays very well.  No damage.  See the photographs for exact condition.
Size: saucer about 17cm wide , cup about 6.2 cm high
Weight: 400  grams.