The napkin ring has engraving I think and would be better if cleaned with a good silver polish !! Silver wasn`t made to leave tarnished,, it will ruin the finish eventually !! Value depends on if sterling or plate and what it looks like when cleaned !!
Lamp is pretty common and likely would only bring about $10. Looks like the bottom was touched up at some point but may just be the pics !!
Round item has feet and is likely a serving tray !! Can`t tell what it is made of but if its wood with inlays,, about $40.
Clock looks early 1900`s mantle clock but face is in poor condition !! Does it run and is anything written on the face ??