This one has eluded me for some years. How difficult should it be when a mark has the full name !
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Found on a small buckle with a London Lion Passant Guardant of the 1740 -1756 form. The buckle is stylistically early and I doubt if it's any later than 1745. It was bought as a pair with another very similar 1740- 1756 buckle - which appears to have been made with the same mark, but then overstamped by another silversmith The newer mark SE has the same "E" as on this mark .
I've tried to make the letters fit for Edmund King , but failed .
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