Antique Porcelain china Rococo Bowl cabinet tea cup and saucer c1825

Rare porcelain hand decorated tea cup and saucer 

• Mark decorators ref 18 but with no makers marks on any pieces
• A fine Victorian rococo open bowl teacup and saucer plate
• Date range 1820-1830
• Irregular scallop rimmed open bowl cup 4-1/8th-inch diameter 2-1/8th-inch tall
• Double arch supported long peaked handle
• 5.75 inch diameter deep saucer plate with indistinct cup well with superb hand coloured linear design and inner rim gilt line. 
• A rare piece of very fine porcelain in very good antique cabinet condition.
• I suspect this china is by Samuel Alcock or Ridgway but no image matches have been identified.