This dish measuring 13 inches x 10 inches, with a depth of 3.5 inches, was manufactured by Ashworth Brothers circa 1930.

Below is a close-up of the crest in the dish. In this dish, the crest does not contain the word 'MENTAL' which can be seen in other tableware. 

The potters mark on the underside of the dish shows that it was made by Ashworth Bothers of  north Staffordshire.