This item is a National Silver Co Knife 9 1/4" Silver Plate Princess Royal 1930. Stamp on the 

Blade NS Co Stainless. This item does have wear from age and use. There are dents on on sides of the handle. Please look at picture 5. This item does need cleaning if you wish. A nice National Silver Co Dinner Knife 9 1/4" Silver Plate Princess Royal 1930 for your Collection, Display, Replacement, and Use.