Simpsons Ambassador Ware: likely from the mid-20th century.

Here's some information about it:

>>Manufacturer: Simpsons (Potters) Ltd, formerly Soho Pottery, located in Cobridge, Stoke-on-Trent, England.

>>Trade Names: Ambassador Ware and Solian Ware.

>>Markings: The base shows the "SIMPSONS Ambassador COBRIDGE ENGLAND" mark.

>>Production Period: Simpsons was renamed in 1944 and ceased tableware production in 1976.

>>Design: The "Ambassador" line is known for its classic shapes and various decorative patterns.

>>Material: Earthenware