Hi Dave, welcome to the forum.
The Dutch sword mark;
The sword (used 1814-1905) and 2nd sword mark used 1906-1953. Standard mark for; small work silver minimum 833 fineness= 83.3% pure silver and used on small work without date letter and office mark and in combination with maker's mark. NB. This sword mark is also used on large works consisting of more than three parts interconnected by links or hinges. On these objects the office mark, standard mark and date letter were spread, one per part, the remaining parts were struck with the sword mark. Two different swords have been used and are hard to keep apart. In 1953 the sword mark with numeral fineness was introduced.
The watch chain, sword mark twice, to indicate the chain consists of more than one part, lock and chain.
The maker's mark
E above
50 for Gerrit van
Ewijck, registered in the city of Schoonhoven in the province of South Holland. Gerrit started 10-5-1836 and stopt 2-5-1865, maker of knife handles, chains and buckles. He was willing to travel to sell his silverware at markets in the Dutch province of Brabant. His son-in-law J.P. Niekerk, who worked for him as a traveling sales representative, took over the workshop in 1865.
Peter.