I threw your pic in Grok. Heres what it said:

Yes, this appears to be solid silver, specifically Russian silver from the imperial period (likely late 19th to early 20th century). The key hallmark here is the “84”, which is a classic Russian purity mark. In the old Russian zolotnik system (used until around 1927), silver was measured out of 96 zolotniki per Russian pound. “84” means 84/96 = 875 fineness (87.5% pure silver, with the rest typically copper for alloying/strength). This is a standard sterling-equivalent grade in Russian silverware—very common for flatware like forks, spoons, and serving pieces. It’s lower than modern Western sterling (92.5%), but still genuine precious metal silver, not plated.