Sotka (bluebill, a bird) features a hand painted feather-like decoration in cobalt blue.
A plate for a main course, often used as a dinner plate. This is usually a flat plate type. A big plate is usually used as a serving dish, a platter, or as an underplate or a charger plate under smaller-sized plates in a table setting.
These beautiful plates show some signs of wear, such as scratches and some minor unevenness on the glazing, like tiny lumps. The additional photo shows examples.