A short lived China ware manufacturer at High Street, Longton, Stoke-on-Trent 

• The business was established by Mr J G Hiles and Mr A E Howard after their acquisition of the assets of Doric China Co from Mr J H Dale in 1948.

• The Clarence Works were renamed Jason Works - the logo adopted for the backstamp was a representation of Jason, the ancient Greek mythological hero and leader of the Argonauts.  

• In 1950 the works were purchased by Susie Cooper as a base for Susie Cooper China Ltd. which was her venture into bone china manufacture. 

Heather Bell is the pattern name 

this appears to be a stock floral pattern with "mother" added in gilt
probably to sell as a Mothers Day gift 
 

J631 is likely to be a 
pattern number