This item is a vintage Spode Copeland China plate in the "Blanche de Chine" line, specifically featuring the "Geisha Blue" (pattern Y3456) design. 

• Manufacturer: Spode (Copeland China), England.

• Pattern: Geisha Blue.

• Body Type: Blanche de Chine white bone china blank.

• Production Era: Produced approximately between 1952 and 1975