You have a piece of English electroplate. The marks read H W S [EP] (A1). HW are the manufacturer’s initials, probably Henry Wilkinson & Co of Sheffield (the “S”). EP is the bit which tells us it’s electroplate, and A1 means best quality (i.e. thickest plating). Note that there was/is no standard for determining the use of A1; it just means that it is that maker’s best quality and it might be different from another makers A1.
If you are unsure about interpreting the sort of characters shown here you can use your computer to print out or display an alphabet in Old English font if you have it installed.