W.R.: These are the initials for William Rogers, a prominent name in American and Canadian silverplate manufacturing during the late 19th and early 20th centuries. 

• Symbols: The cross (specifically a Maltese or iron cross) and the keystone (the shield-shaped symbol with an arrow) are characteristic marks used by the company for specific product lines. 

• Material: This specific combination of marks indicates the item is silver-plated, not solid sterling silver. Silver-plated items consist of a base metal (like nickel or copper) coated in a thin layer of silver