Valuation on bone handled knives and forks

I have purchased a set of 6 knives and 6 forks all of which have bone handles in a box with a key. They are in very good condition. They are stamped with A & D; a capital S and and hourglass. I am delighted with them and have done some basic research on the markings. Please could you indicate to me the value of the set boxed with the key I understand it is a rough estimate. This is my first foray into understanding silver. Such fun. A pound value is fine.
Kind regards,

As these are plated rather than solid silver there is no great value in them. A similar set sold on eBay recently for just over £50.