Walker and hall date help

I am having difficulty in dating this walker and hall silver plate serving dish please can anyone enlighten me. It also has 57 stamped on it



Electroplate cannot normally be dated. However a very few companies used their own private date-coding system and W&H were among that number. Unfortunately the date code is the letter in the mark between S and the flag and you don’t show it sufficiently clearly for it to be read. The shape of the mark puts the date between 1929 and 1952.

Phil

Thank you once again Phil