
Lion passant mark is not very informative here.
Let’s start with Sovereign head ('duty mark'); George III, George IV, William IV. They are all
facing right, punched into an oval escutcheon, from 1786 to 1838.
As far as I know, there was no single letter ``S`` maker in London, Birmingham, nor Sheffield. But it seems there was another letter in the last mark, after S, not well struck. It could be maker’s mark.Even when not struck well one can see it under higher magnification.
So, the first
S is date letter; search for ``S`` and depending on escutcheon you will most probably figure out the date.
Correct me if I am wrong — this is all I can tell.