925 identifies 92.5% silver alloy, commonly called sterling. EPNS and silver plate describe a coating; their total weight cannot be valued as 925 silver.
Read the fineness
Divide the number by 1,000 to get the silver fraction. Check the whole set of marks and the item’s construction before using it.
A marked handle is not a weighed blade
Separate steel blades, filled handles and weighted bases from the net silver-alloy weight. A 925-marked hollow handle does not make its cement filling or attached blade silver. If separation would damage the item, ask for a net-weight estimate before accepting a scrap offer.
Use the complete hallmark
On UK silver, the sponsor, fineness and assay-office marks identify the hallmark. An optional date letter helps date the hallmark, rather than giving a silver percentage.