Identifying if the item is silver or not

Hi. I wonder if anyone can help at all. I bought some solid silver items, and in with them was a solid metal pig and piglets. The pig is stamped with the attached markings, but i cant seem to find it anywhere. Can anyone confirm if its silver or not? Thank you in advance

It’s pewter. The seahorse mark (on the right in your picture) is a mark used by members of the Association of British Pewter Craftsmen.

Phil