Boxed Silver Plated Fish Servers and Knives and Forks Set

Boxed Silver Plated Fish Servers and Knives and Forks
I am selling these on behalf of my mother. Unfortunately I cannot see any maker's details or a date. They belonged to my Great-Grandmother so I assume the are from the first half of the last century.
They are a little tarnished and have not been used for years, just sat in a cupboard. They have the mark EPNS. The box is in good condition for its age.
From a smoke free home. Any other information needed, please ask.